74 + Interview Questions in Electro Chemical Cells and Corrosion in Applied Chemistry Page 2 InterviewSolution

51.	The oxidation resistance is given by the protective coatings.(a) True(b) FalseI had been asked this question by my college professor while I was bunking the class.The query is from Protective Coatings topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right CHOICE is (a) True To EXPLAIN I would say: The protective LAYER is USED to provide the oxidation resistance to the metal and to give thermal insulating PROPERTIES of the metal.

Discussion

52.	In corrosion, as a result of decay, the metals are not converted into __________(a) Oxides(b) Hydroxides(c) Carbonates(d) PeroxidesThis question was posed to me in a national level competition.My question is based upon Corrosion in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right answer is (d) Peroxides The BEST explanation: In corrosion, as a result of DECAY the metals are not converted into PEROXIDE. They are converted into the OXIDES, HYDROXIDES, carbonates and sulphides.

Discussion

53.	The rusting iron is the __________(a) Oxidation corrosion(b) Liquid metal corrosion(c) Wet corrosion(d) Corrosion by other gasesThis question was addressed to me in examination.My doubt stems from Types of Corrosion and Passivity in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct answer is (a) Oxidation CORROSION Explanation: The rusting of iron comes under the oxidation corrosion. Direct action OXYGEN at HIGH or low TEMPERATURES will be on METALS.

Discussion

54.	The energy of the fuel cells ___________(a) Can be recharged(b) Cannot be recharged(c) Is stored(d) Cannot be saidThe question was asked in homework.Enquiry is from Types of Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT ANSWER is (C) Is stored To elaborate: The energy of the fuel CELLS is stored. Energy can be withdrawn indefinitely as long as outside SUPPLY of fuel is maintained.

Discussion

55.	The emf of the Weston standard cell is __________ at 20^oC.(a) 16.7989V(b) 5.2572V(c) 1.0183V(d) 0VI got this question during a job interview.My question is based upon Types of Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct choice is (c) 1.0183V To explain I WOULD SAY: The ELECTRO motive force of the WESTON standard CELL is 1.0183V at 20^oC and It varies slightly by 0.0000406V per change of 1^oC.

Discussion

56.	Decrease in free energy can be given by -ΔG = __________(a) nFE(b) n/FE(c) nF/E(d) F/nEI have been asked this question during an internship interview.I would like to ask this question from Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct answer is (a) NFE To explain I would say: Decrease in FREE energy can be given by -ΔG = nFE where N= VALENCY of ion, E = emf of cell and F=faraday.

Discussion

57.	The process of gaining of electrons by metal ions with a discharge of metal is called __________(a) De-electronation(b) Electronation(c) Reduction(d) CathodeThe question was asked during an internship interview.I need to ask this question from Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right ANSWER is (a) De-electronation For explanation: The process of gaining of electrons by METAL IONS with DISCHARGE metal is called de-electronation or oxidation or anode.

Discussion

58.	Which of the following comes under the wet corrosion?(a) Concentration cell corrosion(b) Oxidation corrosion(c) Liquid metal corrosion(d) Corrosion by other gasesThe question was posed to me during an online interview.Question is taken from Types of Corrosion and Passivity topic in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» CORRECT option is (a) Concentration CELL corrosion The best explanation: Oxidation corrosion, LIQUID metal corrosion and corrosion by other gases comes under the dry concentration and concentration cell corrosion comes under the WET corrosion.

Discussion

59.	In standard calomel electrode, for saturated KCL solution, electrode potential is __________(a) 0.897V(b) 0.456V(c) 0.3512V(d) 0.2415VI got this question in an online quiz.This is a very interesting question from Types of Fuel Cells topic in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right choice is (d) 0.2415V For explanation: In standard CALOMEL electrode, for saturated KCL SOLUTION, electrode POTENTIAL is 0.2415V. The MERCURY of high PURITY is placed at the bottom of this tube.

Discussion

60.	In electrolyte, ionisation ___________ on dilution.(a) Increases(b) Decreases(c) Becomes very small(d) Do not changeI got this question in homework.This interesting question is from Electro Chemical Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» CORRECT answer is (a) Increases For EXPLANATION I would say: In electrolyte, ionisation increases on DILUTION, till the WHOLE of the electrolyte substance has ionised.

Discussion

61.	The e.m.f of Daniel cell is __________(a) 1.02V(b) 1.00V(c) 1.09V(d) 2VThis question was posed to me in a job interview.Query is from Fuel Cells in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct OPTION is (c) 1.09V The explanation: The ELECTRO MOTIVE force of the DANIEL cell is 1.09V. The EMF equation of the Daniel cell is given by Zn + Cu^++ → Zn^++ + Cu.

Discussion

62.	Corrosion along the grain boundaries is called as __________(a) Stress corrosion(b) Inter granular corrosion(c) Water line corrosion(d) Pitting corrosionI got this question in an interview.This key question is from Types of Corrosion and Passivity in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right answer is (B) INTER GRANULAR corrosion The explanation is: Corrosion ALONG the grain boundaries is called as the inter granular corrosion and stress corrosion is due to the STATIC tensile strength.

Discussion

63.	Corrosion due to the flow of the _________ between the cathodic and anodic areas is called as the electro chemical corrosion by evolution of hydrogen ad absorption of oxygen.(a) Electron current(b) Proton current(c) Ion current(d) Neutron currentI had been asked this question in an online quiz.Question is from Types of Corrosion and Passivity in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct answer is (a) Electron CURRENT Easiest EXPLANATION: Corrosion due to the flow of the electron current between the cathodic and anodic areas is called as the ELECTRO chemical corrosion by the evolution of HYDROGEN ad absorption of OXYGEN.

Discussion

64.	The strength of the current is measured in terms of ___________(a) Coulombs(b) Joules(c) Amperes(d) OhmsI had been asked this question during an interview for a job.My doubt is from Fuel Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The CORRECT answer is (c) AMPERES To EXPLAIN: The strength of the current is measured by amperes. The ampere is defined as the current which deposits 0.001118g of silver PER second from a 15% solution of silver nitrate in a voltameter of definite directions.

Discussion

65.	According to the convention, the Daniel cell is represented as ________(a) Zn l ZnSO4 ll CuSO4 l Cu, E = 1.09 volt(b) Zn l ZnSO4 ll Cu l CuSO4, E = 1.09 volt(c) ZnSO4 l Zn ll CuSO4 l Cu, E = 1.09 volt(d) Zn l ZnS ll CuSO4 l Cu, E = 1.09 voltI had been asked this question during a job interview.The query is from Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right OPTION is (a) Zn l ZnSO4 ll CuSO4 l Cu, E = 1.09 volt The BEST explanation: According to the CONVENTION, the Daniel CELL is represented as Zn l ZnSO4 ll CuSO4 l Cu, E = 1.09 volt. Here E is the emf of the cell.

Discussion

66.	Mercuric chloride is a strong electrolyte.(a) True(b) FalseThis question was addressed to me in an interview for job.I want to ask this question from Electro Chemical Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The CORRECT answer is (b) False The BEST I can EXPLAIN: Almost all salts are strong electrolytes practically. The mercuric CHLORIDE and LEAD acetate are the weak electrolytes.

Discussion

67.	To detect the flow of current a head telephone ear piece is used instead of __________(a) Ammeter(b) Galvanometer(c) Multimeter(d) VoltmeterThe question was asked during an online interview.This is a very interesting question from Electro Chemical Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Right answer is (b) Galvanometer Easy explanation: Instead of galvanometer, to detect the flow of CURRENT a head telephone EARPIECE is USED to determine the equivalent conductance.

Discussion

68.	The specific conductance of the electrolyte ___________ on dilution.(a) Increases(b) Decrease(c) Slightly increases(d) Cannot be determinedI got this question by my school principal while I was bunking the class.I need to ask this question from Electro Chemical Cells in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» CORRECT choice is (b) Decrease Easy EXPLANATION: The SPECIFIC CONDUCTANCE of the electrolyte decreases on dilution. EQUIVALENT conductance increases on dilution.

Discussion

69.	The degree of ionisation is given by____________(a) α = λv * λα(b) α = λv / λα(c) α = λv – λα(d) α = λv + λαThis question was posed to me in homework.My enquiry is from Electro Chemical Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT option is (b) α = λv / λα The BEST explanation: The DEGREE of ionisation is GIVEN by α = λv / λα where α = degree of ionisation, λα = equivalent conductance at infinite dilution.

Discussion

70.	Specific conductance is expressed in terms of __________(a) Ohm/cm(b) Ohm.cm(c) Ohm^-1 cm^-1(d) Ohm^-1 cmThe question was posed to me in examination.The question is from Electro Chemical Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct ANSWER is (c) Ohm^-1 cm^-1 For explanation I WOULD say: Specific conductance is EXPRESSED in terms of ohm-1 cm-1 As we KNOW that k=l/S * 1/S = cm/[(cm)^2 * ohm] =Ohm^-1 cm^-1.

Discussion

71.	The resistance of the conductor in the electrolytic cell ___________ with an increase in temperature.(a) Increase(b) Decrease(c) Slightly increase(d) Do no changeThis question was addressed to me in a job interview.I'd like to ask this question from Electro Chemical Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct choice is (B) Decrease Easy EXPLANATION: The resistance of the conduction in the electrolytic CELL decreases with increase in the temperature. In metallic CONDUCTORS, resistance of the conductor INCREASES with increase in temperature.

Discussion

72.	In electrolytic conductors, the conductance is due to _____________(a) Flow of free mobile electrons(b) Movement of ions(c) Either movement of electrons or ions(d) Cannot be saidI had been asked this question in class test.Question is from Electro Chemical Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» The correct choice is (B) Movement of ions Easiest explanation: In metallic conductors, the conductance is due to the flow of FREE MOBILE ELECTRONS and in electrolytic conductors, the conductance is due to the movement of ions in a solution of FUSED electrolyte.

Discussion

73.	Which of the following is the example of the electrolytes?(a) Acids(b) Metals(c) Alloys(d) OxidesThis question was addressed to me by my college director while I was bunking the class.This intriguing question comes from Electro Chemical Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» Correct choice is (a) ACIDS The best I can explain: The acids and bases are the EXAMPLES of the ELECTROLYTES and some solid salts, METALS, alloys and OXIDES are the examples of the metallic conductors.

Discussion

74.	The process of decomposition of an electrolyte by passing electric current through its solution is called as __________(a) Electrolyte(b) Electrode(c) Electrolysis(d) Electrochemical cellThe question was posed to me in class test.This intriguing question comes from Electro Chemical Cells topic in portion Electro Chemical Cells and Corrosion of Applied Chemistry
Answer» RIGHT answer is (c) Electrolysis To ELABORATE: The process of DECOMPOSITION of an electrolyte by passing electric CURRENT through its solution is called as electrolysis.

Discussion

Explore topic-wise InterviewSolutions in .

The oxidation resistance is given by the protective coatings.(a) True(b) FalseI had been asked this question by my college professor while I was bunking the class.The query is from Protective Coatings topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

In corrosion, as a result of decay, the metals are not converted into __________(a) Oxides(b) Hydroxides(c) Carbonates(d) PeroxidesThis question was posed to me in a national level competition.My question is based upon Corrosion in section Electro Chemical Cells and Corrosion of Applied Chemistry

The rusting iron is the __________(a) Oxidation corrosion(b) Liquid metal corrosion(c) Wet corrosion(d) Corrosion by other gasesThis question was addressed to me in examination.My doubt stems from Types of Corrosion and Passivity in section Electro Chemical Cells and Corrosion of Applied Chemistry

The energy of the fuel cells ___________(a) Can be recharged(b) Cannot be recharged(c) Is stored(d) Cannot be saidThe question was asked in homework.Enquiry is from Types of Fuel Cells in section Electro Chemical Cells and Corrosion of Applied Chemistry

The emf of the Weston standard cell is __________ at 20^oC.(a) 16.7989V(b) 5.2572V(c) 1.0183V(d) 0VI got this question during a job interview.My question is based upon Types of Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry

Decrease in free energy can be given by -ΔG = __________(a) nFE(b) n/FE(c) nF/E(d) F/nEI have been asked this question during an internship interview.I would like to ask this question from Fuel Cells topic in section Electro Chemical Cells and Corrosion of Applied Chemistry

In electrolyte, ionisation ___________ on dilution.(a) Increases(b) Decreases(c) Becomes very small(d) Do not changeI got this question in homework.This interesting question is from Electro Chemical Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

The e.m.f of Daniel cell is __________(a) 1.02V(b) 1.00V(c) 1.09V(d) 2VThis question was posed to me in a job interview.Query is from Fuel Cells in portion Electro Chemical Cells and Corrosion of Applied Chemistry

The strength of the current is measured in terms of ___________(a) Coulombs(b) Joules(c) Amperes(d) OhmsI had been asked this question during an interview for a job.My doubt is from Fuel Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

Mercuric chloride is a strong electrolyte.(a) True(b) FalseThis question was addressed to me in an interview for job.I want to ask this question from Electro Chemical Cells topic in division Electro Chemical Cells and Corrosion of Applied Chemistry

The degree of ionisation is given by____________(a) α = λv * λα(b) α = λv / λα(c) α = λv – λα(d) α = λv + λαThis question was posed to me in homework.My enquiry is from Electro Chemical Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

Specific conductance is expressed in terms of __________(a) Ohm/cm(b) Ohm.cm(c) Ohm^-1 cm^-1(d) Ohm^-1 cmThe question was posed to me in examination.The question is from Electro Chemical Cells topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry