74 + Interview Questions in Electro Chemical Cells and Corrosion in Applied Chemistry Page 1 InterviewSolution

1.	Tinning is the example of __________(a) Anodic coatings(b) Cathodic coatings(c) Neither anode nor cathode(d) Both anode and cathodeThis question was posed to me in an internship interview.This intriguing question comes from Protective Coatings topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct choice is (B) Cathodic COATINGS To ELABORATE: Tinning is an example of the cathodic coatings. The galvanisation COMES under the anodic coatings.

Discussion

2.	The protective coatings are used to ___________(a) Corrode the metal(b) Prevent from corrosion(c) Increase the corrosion(d) Slightly increase the corrosionThis question was posed to me in an interview for job.My query is from Protective Coatings in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct answer is (b) Prevent from CORROSION Explanation: The PROTECTIVE coatings are USED to prevent the corrosion of the metal. The protective layers are thin layer on the SURFACE of the metal.

Discussion

3.	Wet corrosion is also called as ____________(a) Chemical cell(b) Electro chemical cell(c) Oxidation reaction(d) Liquid metal corrosionI got this question at a job interview.The doubt is from Types of Corrosion and Passivity topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right option is (b) ELECTRO chemical cell Easy explanation: Wet CORROSION is ALSO called as the electro chemical corrosion. Corrosion DUE to the conducting liquid in contact with CATHODIC and anodic areas is called as wet corrosion.

Discussion

4.	In pickling and etching _________ acids are used.(a) Sulphuric acid(b) Hypo chlorous acid(c) Phosphoric acid(d) Phosphorous acidThe question was posed to me in class test.My doubt stems from Protective Coatings topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right choice is (a) SULPHURIC acid For explanation: In PICKLING and etching process, the acids USED are HYDROCHLORIC acid, sulphuric acid and nitric acid.

Discussion

5.	Corrosion is uniform in __________(a) Dry corrosion(b) Wet corrosion(c) Pitting corrosion(d) Water line corrosionThis question was posed to me in my homework.I need to ask this question from Types of Corrosion and Passivity in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct CHOICE is (a) Dry CORROSION Easy EXPLANATION: In dry corrosion, the corrosion is uniform and in the wet corrosion, the corrosion is not uniform. PITTING and water line corrosion COMES under the wet corrosion.

Discussion

6.	The process of coating iron or steel sheet with a thin coat of zinc to prevent iron from rusting is called ____________(a) Tinning(b) Galvanisation(c) Metal cladding(d) ElectroplatingI have been asked this question at a job interview.The question is from Protective Coatings topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct choice is (b) Galvanisation Easy EXPLANATION: The process of COATING iron or steel sheet with a thin coat of zinc to prevent iron from rusting is called galvanisation. The process of depositing the coating METAL on the surface of the BASE metal by electrolysis is called electroplating.

Discussion

7.	The drawback of this battery is the working voltage of battery is _________ due to the internal losses.(a) Higher(b) Lower(c) Moderate(d) Not considerableI had been asked this question during an online interview.This intriguing question originated from Corrosion topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT CHOICE is (b) Lower To EXPLAIN: The DRAWBACK of this battery is the working VOLTAGE of battery is lower due to the internal losses in the zinc-air batteries.

Discussion

8.	The amount of iron wasted by corrosion each year is estimated about _________ of its annual production.(a) 1(b) 1/2(c) 1/4(d) 1/8I had been asked this question at a job interview.This intriguing question comes from Corrosion in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The CORRECT option is (C) 1/4 For explanation I would say: The amount of the IRON wasted YEARLY is about 1/4 of its annual PRODUCTION. The iron is lost by forming its compounds in the process of corrosion.

Discussion

9.	Iron undergoes corrosion to produce __________ coloured hydrated ferric oxide.(a) Red(b) Brown(c) Green(d) BlueI got this question by my school principal while I was bunking the class.Question is from Corrosion topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct CHOICE is (b) BROWN To explain: IRON UNDERGOES corrosion to produce the brown coloured hydrated ferric oxide which is nothing but rust on the surface of the metal.

Discussion

10.	In anodic coatings, the coating metals possess __________ reduction potential than base metal.(a) Higher(b) Lower(c) Zero(d) Cannot be saidThis question was posed to me in a job interview.This interesting question is from Protective Coatings in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct choice is (b) LOWER For EXPLANATION I would say: In anodic COATING, the coating metals POSSESS the lower REDUCTION potential than base metal. The coating metals possess the higher reduction potential than base metal.

Discussion

11.	For 1N KCL standard reduction potential in the calomel electrode is __________(a) 0.28V(b) 0.25V(c) 0.5V(d) 1VThis question was addressed to me by my college director while I was bunking the class.Origin of the question is Types of Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct answer is (a) 0.28V Best explanation: For 1N KCL standard reduction in the CALOMEL ELECTRODE is 0.28V. For 0.1N KCL solution the reduction POTENTIAL is 0.3338V.

Discussion

12.	Dry corrosion is also called as _________(a) Chemical corrosion(b) Electrochemical corrosion(c) Wet corrosion(d) Oxidation corrosionThis question was addressed to me during a job interview.Origin of the question is Types of Corrosion and Passivity topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct option is (a) Chemical corrosion To elaborate: Dry corrosion is ALSO CALLED as the chemical corrosion. The corrosion is DIVIDED into two TYPES. They are dry corrosion and WET corrosion.

Discussion

13.	Anhydrous inorganic liquid metal surface in absence of moisture undergoes ___________(a) Wet corrosion(b) Dry corrosion(c) Galvanic corrosion(d) Pitting corrosionI got this question in my homework.The above asked question is from Types of Corrosion and Passivity topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct ANSWER is (B) Dry corrosion The BEST explanation: Anhydrous inorganic liquid metal surface in absence of moisture undergoes the dry corrosion. Atmospheric GASES also undergo dry corrosion.

Discussion

14.	Which of the following is the weak base electrolyte?(a) NaOH(b) KOH(c) Ca(OH)2(d) Alkyl aminesThe question was posed to me in an interview for job.This question is from Electro Chemical Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct OPTION is (d) Alkyl amines For explanation I would say: NaOH, KOH and CA(OH)2 are STRONG base ELECTROLYTES and the alkyl amines are the weak base electrolytes.

Discussion

15.	Corrosion due to difference in water level is __________(a) Soil corrosion(b) Oxidation corrosion(c) Pitting corrosion(d) Water line corrosionThe question was asked by my college professor while I was bunking the class.Query is from Types of Corrosion and Passivity topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right choice is (d) Water line corrosion Explanation: Corrosion due to the difference in water LEVEL is water line corrosion. Corrosion due to the FORMATION of VARYING CONCENTRATIONS of the aeration.

Discussion

16.	The emf of the cathode in the zinc-air batteries is __________(a) 0.1V(b) 0.2V(c) 0.3V(d) 0.4VI had been asked this question in an interview.My doubt is from Corrosion topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT OPTION is (d) 0.4V Easiest explanation: The electromotive FORCE of the CATHODE of the zinc-air batteries is 0.4V. The cathode has the POSITIVE potential and the oxygen acts as the cathode.

Discussion

17.	Electronation is also called as ___________ electrode.(a) Oxidation(b) Reduction(c) Electrifying(d) Electro chemical cellI had been asked this question in an online interview.Question is taken from Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right option is (b) Reduction To explain I WOULD say: ELECTRONATION is the reverse process of gaining ELECTRONS by METAL ions that means reduction ELECTRODE or cathode.

Discussion

18.	Electrolytes obey __________ to the some extent as metallic conductors.(a) Specific conductance(b) Ohms law(c) Molecular conductance(d) Equivalent conductanceThis question was posed to me during an online exam.This interesting question is from Fuel Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct answer is (b) Ohms law Easy explanation: Electrolytes obey ohms law to some EXTENT as metallic CONDUCTORS. The current I flowing is equal to the ratio of ELECTROMOTIVE FORCE to the resistance.

Discussion

19.	The electrolyte is placed in a special type of cell known as ____________(a) Conductivity cell(b) Conductance cell(c) Equivalent cell(d) Conduction cellThis question was posed to me in an interview for internship.The doubt is from Electro Chemical Cells topic in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct answer is (b) CONDUCTANCE cell For explanation I WOULD say: The ELECTROLYTE is placed in a SPECIAL type of cell known as conductance cell. The conductance is made of HIGHLY resistant glass such as pyrex or quartz.

Discussion

20.	Which of the following are the strong electrolytes?(a) HCL(b) Acetic acid(c) Propinoic acid(d) H2SO3I got this question in an interview.My doubt stems from Electro Chemical Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct choice is (a) HCL The EXPLANATION is: The strong electrolyte is HCL because it is strong ACID and acts as electrolyte. The acetic acid, propinoic acid and H2SO3 are weak acid electrolytes.

Discussion

21.	The calomel electrode is only used as _________(a) Oxidising electrode(b) Reducing electrode(c) Depends on the half cell(d) Cannot be saidI had been asked this question during an interview.My enquiry is from Types of Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct CHOICE is (B) REDUCING electrode To explain: The calomel electrode is used only as a reducing electrode. The electrolyte used is a SOLUTION of POTASSIUM chloride.

Discussion

22.	The emf of the standard hydrogen electrode is ____________(a) 0V(b) 1V(c) 2V(d) 3VThe question was posed to me in a national level competition.The above asked question is from Types of Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct CHOICE is (a) 0V The best explanation: The ELECTRO motive force of the standard hydrogen electrode is 0V. DEPENDING on the HALF cell attached, hydrogen cell acts as anode or cathode.

Discussion

23.	Corrosion due to the corrosiveness of the soil is called as ___________(a) Soil corrosion(b) Oxidation corrosion(c) Galvanic corrosion(d) Concentration cell corrosionThis question was addressed to me during an interview.This interesting question is from Types of Corrosion and Passivity in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The CORRECT option is (a) SOIL CORROSION Explanation: Corrosion due to the CORROSIVENESS of the soil is called as the soil corrosion. Direct action of the oxygen on metal causes oxidation corrosion.

Discussion

24.	The temperature maintained in the standard hydrogen electrode is _____________(a) 22^oC(b) 23^oC(c) 24^oC(d) 25^oCI got this question during an online interview.I need to ask this question from Types of Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT ANSWER is (d) 25^oC The EXPLANATION: The temperature maintained in the standard hydrogen electrode is 25^oC, pressure is maintained at 1 ATMOSPHERE.

Discussion

25.	The cleaning methods before applying the protective coating are of _________ types.(a) 3(b) 4(c) 5(d) 6This question was addressed to me by my school principal while I was bunking the class.The origin of the question is Protective Coatings topic in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» CORRECT answer is (d) 6 For EXPLANATION I would SAY: The cleaning methods before applying the protective coating are of 6 types. They are SOLVENT cleaning, alkali cleaning, mechanical cleaning, flame cleaning, sand blasting and pickling and etching.

Discussion

26.	Dry corrosion takes place in __________(a) Homogeneous solutions(b) Heterogeneous solutions(c) Neither homogeneous nor heterogeneous(d) Both homogeneous and heterogeneous solutionsI have been asked this question at a job interview.Question is taken from Types of Corrosion and Passivity topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» CORRECT CHOICE is (d) Both HOMOGENEOUS and heterogeneous solutions To explain: Dry corrosion TAKES place in both homogeneous and heterogeneous solutions. The wet corrosion takes place in only heterogeneous processes.

Discussion

27.	Chemical action of flowing liquid metal at high temperatures is __________(a) Liquid metal corrosion(b) Corrosion by other gases(c) Oxidation corrosion(d) Wet corrosionI had been asked this question in an internship interview.The query is from Types of Corrosion and Passivity in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» CORRECT answer is (a) LIQUID metal corrosion The best explanation: Chemical ACTION of FLOWING liquid metal at high temperatures is called liquid metal corrosion.

Discussion

28.	Generally electrode potential refers to __________(a) Reduction potential(b) Oxidation potential(c) Electron potential(d) Cannot be determinedThis question was posed to me by my college director while I was bunking the class.This question is from Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct answer is (a) Reduction potential The EXPLANATION is: GENERALLY, the ELECTRODE potential REFERS to the reduction potential. The reduction potential can be expressed in terms of oxidation potential by placing negative symbol before it.

Discussion

29.	In primary cells reaction is not reversible.(a) True(b) FalseThe question was asked in an online interview.This intriguing question comes from Types of Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT OPTION is (a) True The BEST explanation: In primary cells, the REACTION is not reversible and in secondary cells, the reaction can be reversed.

Discussion

30.	In sand blasting, the atmospheric pressure is about __________(a) 25-100atm(b) 50-100atm(c) 70-100atm(d) 100-250atmThe question was posed to me in exam.This interesting question is from Protective Coatings in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT option is (a) 25-100atm Best explanation: In SAND blasting, the ATMOSPHERIC pressure is about 25-100atm. The sand blasting will blast with sand particles of DIFFERENT sizes.

Discussion

31.	The emf of the anode in zinc-air batteries is ___________(a) -1V(b) -1.25V(c) 1V(d) 1.25VThe question was posed to me in an interview for job.This interesting question is from Corrosion topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right choice is (b) -1.25V Best EXPLANATION: The ELECTROMOTIVE FORCE of the anode in zinc-air BATTERIES is -1.25. The anode is having negative potential.

Discussion

32.	The advantages of the nickel metal hydrated batteries are having _________ more energy than the nickel cadmium batteries.(a) 100%(b) 50%(c) 75%(d) 25%The question was asked in an international level competition.The question is from Corrosion topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT ANSWER is (c) 75% EXPLANATION: The advantages of the nickel metal HYDRATED batteries are having 50% more ENERGY than the nickel cadmium batteries.

Discussion

33.	If the standard hydrogen electrode is used as the reduction electrode, then the emf is given by __________(a) Ered = -E^o + (5/n) log10 [H^+](b) Ered = -E^o – (0.0591/n) log10 [H^+](c) Ered = E^o + (0.0591/n) log10 [H^+](d) Ered = -E^o + (0.0591/n) log10 [H^+]This question was posed to me during an online exam.This intriguing question originated from Types of Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct choice is (d) ERED = -E^o + (0.0591/n) log10 [H^+] The EXPLANATION: If the standard hydrogen electrode is USED as the reduction electrode, then the emf can be given by Ered = -E^o + (0.0591/n) log10 [H^+] that is Ered = – EOX.

Discussion

34.	Which of the following is not lost during corrosion?(a) Malleability(b) Ductility(c) Conductivity(d) ColourThis question was addressed to me in final exam.My question is based upon Corrosion topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct OPTION is (d) Colour To EXPLAIN: Colour of the metal is not lost during the CORROSION. The physical properties of the metal LIKE Malleability, ductility and conductivity are lost.

Discussion

35.	The metals except ________ exist in nature in the form of their minerals or ores.(a) Gold(b) Silver(c) Copper(d) IronI got this question during a job interview.This question is from Corrosion in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT choice is (a) Gold For explanation I would say: Most of the metals except gold and PLATINUM exist in nature in the form of their MINERALS or ores, in the stable combine forms as OXIDE, CHLORIDES, etc.

Discussion

36.	In standard hydrogen electrode, concentration of hydrogen is ____________(a) 0M(b) 0.5M(c) 1M(d) 1.5MThis question was posed to me by my college director while I was bunking the class.My query is from Types of Fuel Cells in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct CHOICE is (C) 1M The EXPLANATION: In standard hydrogen electrode, the concentration of hydrogen is 1 molar and the PRESSURE is about 1atm.

Discussion

37.	Which of the following is the correct equation?(a) E = E^o [(2.303RT)/nF] log10 [H^+](b) E = E^o + [(2.303RT)/nF] log10 [H^+](c) E = E^o – [(2.303RT)/nF] log10 [H^+](d) E = E^o/[(2.303RT)/nF] log10 [H^+]The question was posed to me during an online exam.I want to ask this question from Types of Fuel Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right CHOICE is (C) E = E^o – [(2.303RT)/nF] log10 [H^+] To elaborate: E = E^o – [(2.303RT)/nF] log10 [H^+] is called Nernst equation. Where, E = single electrode potential, E^o = standard electrode potential, n = valency of ION, F = FARADAY.

Discussion

38.	The quantity of current passing through a conductor is expressed in terms of __________(a) Joules(b) Coulombs(c) Amperes(d) OhmsThe question was asked by my school teacher while I was bunking the class.My question is taken from Fuel Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct option is (b) Coulombs Explanation: The QUANTITY of CURRENT passing through a CONDUCTOR is expressed in TERMS of coulombs. It is the product of current strength and time.

Discussion

39.	In Daniel cell, the two electrodes are separated by salt bridge.(a) True(b) FalseThe question was posed to me by my school teacher while I was bunking the class.My question is taken from Fuel Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right answer is (a) True To explain: In DANIEL cell the ANODE and cathode are SEPARATED by the salt bridge.from a SOLUTION of zinc SULPHATE and and copper sulphate solutions.

Discussion

40.	The movement of electrons in Daniel cell is from _________ to _________(a) Zn to Cu(b) Cu to Zn(c) Zn to Ca(d) Ca to ZnThis question was posed to me during an online exam.My enquiry is from Fuel Cells in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct answer is (a) Zn to Cu For explanation I would SAY: The movement of the electrons in DANIEL cell is from zinc to copper. It PRODUCES the current in the CIRCUIT and the net CHEMICAL change described as the cell reaction.

Discussion

41.	___________ is the device used to measure the emf of the cell.(a) Voltmeter(b) Potentiometer(c) Ammeter(d) MultimeterThis question was posed to me in an online interview.This intriguing question comes from Types of Fuel Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The CORRECT option is (b) POTENTIOMETER Explanation: The potentiometer is the DEVICE used to measure the ELECTRO motive force of the cell. AMMETER is used to measure the quantity of current.

Discussion

42.	The old paint coating cannot be removed by __________(a) Soaps(b) Caustic soda(c) Trisodium phosphate(d) Sulphuric acidI had been asked this question in an international level competition.This question is from Protective Coatings topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct OPTION is (d) SULPHURIC acid The EXPLANATION: The OLD paint coatings can be removed by ALKALI cleaning process. The Soaps, caustic soda and trisodium phosphate are used.

Discussion

43.	Corrosion due to the formation of cavities around the metal is called as the ___________(a) Pitting corrosion(b) Soil corrosion(c) Water line corrosion(d) Galvanic corrosionThe question was asked by my school teacher while I was bunking the class.My doubt is from Types of Corrosion and Passivity in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct option is (a) PITTING CORROSION Explanation: Corrosion due to the formation of cavities AROUND the metal is called as the pitting corrosion. Corrosion between the dissimiliar metals is called galvanic corrosion.

Discussion

44.	During the sand blasting process, the workers are affected by the disease called _________(a) Silicosis(b) Chicken guinea(c) Blue baby syndrome(d) FlourosisThis question was addressed to me during an interview.My doubt is from Protective Coatings in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The CORRECT answer is (a) Silicosis For explanation: During the SAND blasting PROCESS, the workers are affected by the disease called as the silicosis. It is one the main disadvantages of this method.

Discussion

45.	Nickel metal hydrated batteries having the low cell voltage of __________(a) 1V(b) 1.2V(c) 1.3V(d) 1.4VThis question was posed to me in a national level competition.My doubt stems from Corrosion in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right option is (b) 1.2V To ELABORATE: Nickel METAL hydrated BATTERIES are having very LOW cell VOLTAGES. It is having a voltage of 1.2V.

Discussion

46.	Which of the following is the correct reaction at anode?(a) Zn→Zn^+2 + 2e^–(b) Zn→Zn^+ + e^–(c) Cu^+2 + 2e^– → Cu(d) Cu^++ e^– → CuThe question was asked in unit test.This interesting question is from Fuel Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT ANSWER is (a) Zn→Zn^+2 + 2e^– For EXPLANATION: The REACTION at ANODE can be given by Zn→Zn^+2 + 2e^–. The reaction at cathode Cu^+2 + 2e^– → Cu.

Discussion

47.	Corrosion between the dissimilar metals is called as __________(a) Galvanic corrosion(b) Dry corrosion(c) Oxidation corrosion(d) Concentration cell corrosionI have been asked this question in an internship interview.This interesting question is from Types of Corrosion and Passivity topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct CHOICE is (a) GALVANIC corrosion Best explanation: Corrosion between the DISSIMILAR metals is CALLED as the galvanic corrosion. Dry corrosion also called as the CHEMICAL corrosion.

Discussion

48.	In zinc-air cells are composed of three parts of zinc used as ___________(a) Anode(b) Cathode(c) Based on the half cell(d) Can’t be saidThe question was posed to me in an interview for job.My question is based upon Corrosion topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct option is (a) ANODE Easiest EXPLANATION: Zinc-AIR cells are composed of THREE PARTS of zinc used as an anode, an air electrode is used as the cathode.

Discussion

49.	The corrosion is the reverse process of ____________(a) Metal extraction(b) Metal production(c) Metal heating(d) Metal mouldingThe question was posed to me in an interview for job.Origin of the question is Corrosion topic in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT choice is (a) Metal extraction The EXPLANATION is: The corrosion is the REVERSE process of the metal extraction. In the pure form, metal possess the engineering properties like MALLEABILITY, ductility, etc.

Discussion

50.	The anode of the galvanic cell has __________(a) Positive polarity(b) Negative polarity(c) No polarity(d) NeutralThis question was posed to me during an interview for a job.The question is from Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» CORRECT choice is (b) Negative polarity To explain: The ANODE of the galvanic CELL has a negative polarity because the electrons leave the cell from it.

Discussion

Explore topic-wise InterviewSolutions in .

Wet corrosion is also called as ____________(a) Chemical cell(b) Electro chemical cell(c) Oxidation reaction(d) Liquid metal corrosionI got this question at a job interview.The doubt is from Types of Corrosion and Passivity topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

In pickling and etching _________ acids are used.(a) Sulphuric acid(b) Hypo chlorous acid(c) Phosphoric acid(d) Phosphorous acidThe question was posed to me in class test.My doubt stems from Protective Coatings topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

Corrosion is uniform in __________(a) Dry corrosion(b) Wet corrosion(c) Pitting corrosion(d) Water line corrosionThis question was posed to me in my homework.I need to ask this question from Types of Corrosion and Passivity in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

The amount of iron wasted by corrosion each year is estimated about _________ of its annual production.(a) 1(b) 1/2(c) 1/4(d) 1/8I had been asked this question at a job interview.This intriguing question comes from Corrosion in division Electro Chemical Cells and Corrosion of Applied Chemistry

Iron undergoes corrosion to produce __________ coloured hydrated ferric oxide.(a) Red(b) Brown(c) Green(d) BlueI got this question by my school principal while I was bunking the class.Question is from Corrosion topic in section Electro Chemical Cells and Corrosion of Applied Chemistry

Which of the following is the weak base electrolyte?(a) NaOH(b) KOH(c) Ca(OH)2(d) Alkyl aminesThe question was posed to me in an interview for job.This question is from Electro Chemical Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry

The emf of the cathode in the zinc-air batteries is __________(a) 0.1V(b) 0.2V(c) 0.3V(d) 0.4VI had been asked this question in an interview.My doubt is from Corrosion topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

Electronation is also called as ___________ electrode.(a) Oxidation(b) Reduction(c) Electrifying(d) Electro chemical cellI had been asked this question in an online interview.Question is taken from Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

Which of the following are the strong electrolytes?(a) HCL(b) Acetic acid(c) Propinoic acid(d) H2SO3I got this question in an interview.My doubt stems from Electro Chemical Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

The calomel electrode is only used as _________(a) Oxidising electrode(b) Reducing electrode(c) Depends on the half cell(d) Cannot be saidI had been asked this question during an interview.My enquiry is from Types of Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

The emf of the standard hydrogen electrode is ____________(a) 0V(b) 1V(c) 2V(d) 3VThe question was posed to me in a national level competition.The above asked question is from Types of Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry

The temperature maintained in the standard hydrogen electrode is _____________(a) 22^oC(b) 23^oC(c) 24^oC(d) 25^oCI got this question during an online interview.I need to ask this question from Types of Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

In primary cells reaction is not reversible.(a) True(b) FalseThe question was asked in an online interview.This intriguing question comes from Types of Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry

In sand blasting, the atmospheric pressure is about __________(a) 25-100atm(b) 50-100atm(c) 70-100atm(d) 100-250atmThe question was posed to me in exam.This interesting question is from Protective Coatings in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

The emf of the anode in zinc-air batteries is ___________(a) -1V(b) -1.25V(c) 1V(d) 1.25VThe question was posed to me in an interview for job.This interesting question is from Corrosion topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

Which of the following is not lost during corrosion?(a) Malleability(b) Ductility(c) Conductivity(d) ColourThis question was addressed to me in final exam.My question is based upon Corrosion topic in section Electro Chemical Cells and Corrosion of Applied Chemistry

The metals except ________ exist in nature in the form of their minerals or ores.(a) Gold(b) Silver(c) Copper(d) IronI got this question during a job interview.This question is from Corrosion in division Electro Chemical Cells and Corrosion of Applied Chemistry

In standard hydrogen electrode, concentration of hydrogen is ____________(a) 0M(b) 0.5M(c) 1M(d) 1.5MThis question was posed to me by my college director while I was bunking the class.My query is from Types of Fuel Cells in division Electro Chemical Cells and Corrosion of Applied Chemistry

In Daniel cell, the two electrodes are separated by salt bridge.(a) True(b) FalseThe question was posed to me by my school teacher while I was bunking the class.My question is taken from Fuel Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

The movement of electrons in Daniel cell is from _ to _(a) Zn to Cu(b) Cu to Zn(c) Zn to Ca(d) Ca to ZnThis question was posed to me during an online exam.My enquiry is from Fuel Cells in division Electro Chemical Cells and Corrosion of Applied Chemistry

___________ is the device used to measure the emf of the cell.(a) Voltmeter(b) Potentiometer(c) Ammeter(d) MultimeterThis question was posed to me in an online interview.This intriguing question comes from Types of Fuel Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

Nickel metal hydrated batteries having the low cell voltage of __________(a) 1V(b) 1.2V(c) 1.3V(d) 1.4VThis question was posed to me in a national level competition.My doubt stems from Corrosion in portion Electro Chemical Cells and Corrosion of Applied Chemistry

The corrosion is the reverse process of ____________(a) Metal extraction(b) Metal production(c) Metal heating(d) Metal mouldingThe question was posed to me in an interview for job.Origin of the question is Corrosion topic in portion Electro Chemical Cells and Corrosion of Applied Chemistry

The anode of the galvanic cell has __________(a) Positive polarity(b) Negative polarity(c) No polarity(d) NeutralThis question was posed to me during an interview for a job.The question is from Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry

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Wet corrosion is also called as ____________(a) Chemical cell(b) Electro chemical cell(c) Oxidation reaction(d) Liquid metal corrosionI got this question at a job interview.The doubt is from Types of Corrosion and Passivity topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

In pickling and etching _________ acids are used.(a) Sulphuric acid(b) Hypo chlorous acid(c) Phosphoric acid(d) Phosphorous acidThe question was posed to me in class test.My doubt stems from Protective Coatings topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

Corrosion is uniform in __________(a) Dry corrosion(b) Wet corrosion(c) Pitting corrosion(d) Water line corrosionThis question was posed to me in my homework.I need to ask this question from Types of Corrosion and Passivity in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

The amount of iron wasted by corrosion each year is estimated about _________ of its annual production.(a) 1(b) 1/2(c) 1/4(d) 1/8I had been asked this question at a job interview.This intriguing question comes from Corrosion in division Electro Chemical Cells and Corrosion of Applied Chemistry

Iron undergoes corrosion to produce __________ coloured hydrated ferric oxide.(a) Red(b) Brown(c) Green(d) BlueI got this question by my school principal while I was bunking the class.Question is from Corrosion topic in section Electro Chemical Cells and Corrosion of Applied Chemistry

Which of the following is the weak base electrolyte?(a) NaOH(b) KOH(c) Ca(OH)2(d) Alkyl aminesThe question was posed to me in an interview for job.This question is from Electro Chemical Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry

The emf of the cathode in the zinc-air batteries is __________(a) 0.1V(b) 0.2V(c) 0.3V(d) 0.4VI had been asked this question in an interview.My doubt is from Corrosion topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

Electronation is also called as ___________ electrode.(a) Oxidation(b) Reduction(c) Electrifying(d) Electro chemical cellI had been asked this question in an online interview.Question is taken from Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

Which of the following are the strong electrolytes?(a) HCL(b) Acetic acid(c) Propinoic acid(d) H2SO3I got this question in an interview.My doubt stems from Electro Chemical Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

The calomel electrode is only used as _________(a) Oxidising electrode(b) Reducing electrode(c) Depends on the half cell(d) Cannot be saidI had been asked this question during an interview.My enquiry is from Types of Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

The emf of the standard hydrogen electrode is ____________(a) 0V(b) 1V(c) 2V(d) 3VThe question was posed to me in a national level competition.The above asked question is from Types of Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry

The temperature maintained in the standard hydrogen electrode is _____________(a) 22^oC(b) 23^oC(c) 24^oC(d) 25^oCI got this question during an online interview.I need to ask this question from Types of Fuel Cells in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

In primary cells reaction is not reversible.(a) True(b) FalseThe question was asked in an online interview.This intriguing question comes from Types of Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry

In sand blasting, the atmospheric pressure is about __________(a) 25-100atm(b) 50-100atm(c) 70-100atm(d) 100-250atmThe question was posed to me in exam.This interesting question is from Protective Coatings in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

The emf of the anode in zinc-air batteries is ___________(a) -1V(b) -1.25V(c) 1V(d) 1.25VThe question was posed to me in an interview for job.This interesting question is from Corrosion topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

Which of the following is not lost during corrosion?(a) Malleability(b) Ductility(c) Conductivity(d) ColourThis question was addressed to me in final exam.My question is based upon Corrosion topic in section Electro Chemical Cells and Corrosion of Applied Chemistry

The metals except ________ exist in nature in the form of their minerals or ores.(a) Gold(b) Silver(c) Copper(d) IronI got this question during a job interview.This question is from Corrosion in division Electro Chemical Cells and Corrosion of Applied Chemistry

In standard hydrogen electrode, concentration of hydrogen is ____________(a) 0M(b) 0.5M(c) 1M(d) 1.5MThis question was posed to me by my college director while I was bunking the class.My query is from Types of Fuel Cells in division Electro Chemical Cells and Corrosion of Applied Chemistry

In Daniel cell, the two electrodes are separated by salt bridge.(a) True(b) FalseThe question was posed to me by my school teacher while I was bunking the class.My question is taken from Fuel Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

The movement of electrons in Daniel cell is from _________ to _________(a) Zn to Cu(b) Cu to Zn(c) Zn to Ca(d) Ca to ZnThis question was posed to me during an online exam.My enquiry is from Fuel Cells in division Electro Chemical Cells and Corrosion of Applied Chemistry

Nickel metal hydrated batteries having the low cell voltage of __________(a) 1V(b) 1.2V(c) 1.3V(d) 1.4VThis question was posed to me in a national level competition.My doubt stems from Corrosion in portion Electro Chemical Cells and Corrosion of Applied Chemistry

The corrosion is the reverse process of ____________(a) Metal extraction(b) Metal production(c) Metal heating(d) Metal mouldingThe question was posed to me in an interview for job.Origin of the question is Corrosion topic in portion Electro Chemical Cells and Corrosion of Applied Chemistry

The anode of the galvanic cell has __________(a) Positive polarity(b) Negative polarity(c) No polarity(d) NeutralThis question was posed to me during an interview for a job.The question is from Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry

The movement of electrons in Daniel cell is from _ to _(a) Zn to Cu(b) Cu to Zn(c) Zn to Ca(d) Ca to ZnThis question was posed to me during an online exam.My enquiry is from Fuel Cells in division Electro Chemical Cells and Corrosion of Applied Chemistry