167 + Interview Questions in Water in Applied Chemistry Page 3 InterviewSolution

101.	___________ can be used for the turbid water.(a) Soap titration process(b) Zeolite process(c) Ion exchange process(d) Lime soda processThis question was addressed to me in an interview for job.This interesting question is from Lime Washing Soda Method topic in section Water of Applied Chemistry
Answer» The correct choice is (d) Lime SODA process For explanation: Lime soda process can be used for the turbid water. The lime soda process removes the hardness of the water steps wise by TREATING with different CHEMICALS.

Discussion

102.	In ion exchange process, the iron and manganese ions are removed from the water.(a) True(b) FalseThis question was addressed to me during a job interview.This is a very interesting question from Ion Exchange Process topic in chapter Water of Applied Chemistry
Answer» RIGHT ANSWER is (a) True The explanation: In ion exchange process, not only IRON and manganese ions are REMOVED from the water but also all the cations are removed.

Discussion

103.	The indicator used in the EDTA method is ___________(a) Benzene(b) Phenopthalene(c) Ethylene diamine(d) Erichrome black TThe question was posed to me in an interview for internship.The origin of the question is Estimation of Hardness in portion Water of Applied Chemistry
Answer» Correct ANSWER is (d) Erichrome black T To explain: The indicator USED in the EDTA method is erichrome black T. The hardness causing ions like Ca^++ and MG^++ FORMS the unstable complexes with reacting the erichrome black T.

Discussion

104.	EDTA method is also called as _________(a) Complexometric titration(b) Complex titration(c) Complement titration(d) Complexion titrationI have been asked this question during an interview.My question is based upon Estimation of Hardness in division Water of Applied Chemistry
Answer» Right ANSWER is (a) Complexometric titration The explanation: EDTA METHOD is ALSO CALLED as the complexometric titration. In EDTA method is ethylene diamine tetra acetate is the compound USED to remove the hardness.

Discussion

105.	Total hardness of water can be determined by titrating the fixed volume of water against the standard ___________ solution.(a) Soap(b) Alkaline soap(c) Acidic soap(d) Alcoholic soapI have been asked this question in an online interview.My doubt stems from Estimation of Hardness topic in division Water of Applied Chemistry
Answer» Right choice is (d) ALCOHOLIC soap Explanation: Total hardness of water can be determined by titrating the FIXED VOLUME of water against the standard alcoholic soap SOLUTION.

Discussion

106.	All carbonate and bicarbonates are _________(a) Alkaline(b) Acidic(c) Highly acidic(d) NeutralThe question was posed to me in homework.I'm obligated to ask this question of Estimation of Hardness topic in section Water of Applied Chemistry
Answer» The correct CHOICE is (a) ALKALINE The explanation is: All the carbonates and BICARBONATES are alkaline in nature. So, the hardness DUE to them is CALLED carbonate hardness or alkaline hardness.

Discussion

107.	The hardness of moderately hard water is about _____________(a) 75-150ppm(b) 75-120ppm(c) 75-130ppm(d) 75-100ppmI got this question in an internship interview.The question is from Estimation of Hardness in section Water of Applied Chemistry
Answer» RIGHT choice is (a) 75-150ppm The EXPLANATION: The hardness of CACO3 of moderately hard water is about 75-150ppm. The hardness of the water can be calculated from amount of calcium and magnesium ions PRESENT in water along with bicarbonates, sulphates.

Discussion

108.	Well water in wells located in the areas of oil and gases will contain __________(a) Ethane(b) Methane(c) Carbon(d) NitrogenI have been asked this question in unit test.My question is taken from Sources, Impurities and Hardness of Water topic in chapter Water of Applied Chemistry
Answer» Right OPTION is (b) METHANE To explain I WOULD say: WELL water in wells located in the areas of oil and gases will contain methane gas. When rain water falls on earth and flows on the earth and becomes IMPURE.

Discussion

109.	which of the following does not include in the monitoring of river pollution?(a) Assessing the immediate water quality(b) Development activities in the region(c) Determination of flow increase(d) Colour of the waterI have been asked this question at a job interview.This question is from Monitoring and Control of Water Pollution in portion Water of Applied Chemistry
Answer» Correct option is (d) Colour of the water The best I can explain: Colour of the water is the monitoring of the lake water and for monitoring the river water, we NEED to assess the quality of water, development activities MUST be DONE and water flow INCREASE must be determined.

Discussion

110.	Dried sludge can be used as _________(a) Fertilizer(b) Pesticide(c) Reagent(d) MedicineThis question was addressed to me in an online quiz.The above asked question is from Biological Oxidation Process topic in section Water of Applied Chemistry
Answer» Correct option is (a) FERTILIZER For explanation: Dried sludge can be USED as the fertilizer. It is ONE of the MAIN ADVANTAGES. The sludge is de watered by the filtration in sand beds.

Discussion

111.	The depth of the rectangular circular tanks in the trickling filters method is having the depth of ____________(a) 4m(b) 3m(c) 2m(d) 1mThe question was posed to me in an international level competition.My question comes from Biological Oxidation Process topic in portion Water of Applied Chemistry
Answer» Right answer is (c) 2m To explain I WOULD SAY: The depth of the RECTANGULAR circular tanks in the TRICKLING filters method is having the depth of the 2 metres packed with BROKEN stone pieces or coal etc.

Discussion

112.	Trickling filter method is ___________ than the activated sludge process.(a) Fast(b) Slow(c) Very fast(d) ModerateI got this question in an internship interview.My question is based upon Biological Oxidation Process in chapter Water of Applied Chemistry
Answer» The CORRECT option is (b) Slow Best EXPLANATION: Trickling filter METHOD is slow process than that of the activated SLUDGE process. This process is convenient and cheaper process than the activated sludge process.

Discussion

113.	The BOD value of industrial waste must be about _________(a) 100(b) 200(c) 300(d) 400I had been asked this question in an international level competition.My doubt stems from Methods of Reducing Water Pollution topic in section Water of Applied Chemistry
Answer» The correct choice is (B) 200 To explain I would say: The BOD value of the INDUSTRIAL WASTE must be about the 200. The BOD value of the paper industry waste is about 370.

Discussion

114.	In domestic water treatment, after the primary treatment _________ is done.(a) Screening(b) Sedimentation(c) Aerobic process(d) Anaerobic processThe question was asked in exam.The question is from Methods of Reducing Water Pollution topic in section Water of Applied Chemistry
Answer» Right choice is (a) Screening The explanation is: In domestic water treatment, after the PRIMARY treatment of screening is DONE. LATER sedimentation PROCESS is done.

Discussion

115.	Non hazardous organic wastes from the sewage is to be separated from the ___________(a) Toxic industrial wastes(b) Bacteria(c) Helminth(d) ProtozoaThis question was addressed to me in an interview.Enquiry is from Methods of Reducing Water Pollution in portion Water of Applied Chemistry
Answer» CORRECT choice is (a) Toxic industrial wastes Easiest explanation: NON hazardous organic wastes from the SEWAGE is to be separated from the toxic industrial wastes. The ENTRY of the HARMFUL things into water must be prevented.

Discussion

116.	Variation of hardness of raw water in zeolite process _________(a) Do not affects the exchange process(b) Affects the exchange process(c) Slightly affects the exchange process(d) Some times affects the exchange processI got this question during a job interview.The query is from Permutit’s Process topic in chapter Water of Applied Chemistry
Answer» CORRECT option is (a) Do not affects the EXCHANGE process Best explanation: Variation of HARDNESS of raw water in zeolite process do not AFFECT the exchange process because according to it zeolite bed changes AUTOMATICALLY.

Discussion

117.	___________ water contains more soluble salts than the surface water.(a) Sea water(b) Rain water(c) Underground water(d) Tank waterI got this question in class test.This intriguing question comes from Sources, Impurities and Hardness of Water topic in portion Water of Applied Chemistry
Answer» Right CHOICE is (C) UNDERGROUND WATER Best explanation: Sea water and tank water COMES under the surface water and the under ground water contains more soluble salts than the surface water.

Discussion

118.	EDTA has the ability to form _________ with metal ions.(a) Stable complexes(b) Unstable complexes(c) Salts(d) AcidsThe question was asked by my college professor while I was bunking the class.My question comes from Estimation of Hardness topic in chapter Water of Applied Chemistry
Answer» Right option is (a) STABLE complexes The explanation: EDTA has more affinity to FORM stable complexes by REACTING with metal IONS. The EDTA FORMS the stable EDTA complexes.

Discussion

119.	Deep well water possess the rotten egg smell due to the dissolved ________(a) Sulphide(b) Sulphurous acid(c) Hydrogen sulphide(d) Hydrogen peroxideThis question was posed to me during an online interview.My question is based upon Sources, Impurities and Hardness of Water in division Water of Applied Chemistry
Answer» The CORRECT option is (C) Hydrogen SULPHIDE Explanation: Deep WELL water possesses the rotten EGG smell due to the dissolved hydrogen sulphide. The underground water is colourless and odourless.

Discussion

120.	The treatment of water with _________ improves the taste of water.(a) Oxygen(b) Chlorine(c) KMnO4(d) OzoneI had been asked this question during an online interview.This question is from Biological Oxidation Process in division Water of Applied Chemistry
Answer» RIGHT option is (d) Ozone The BEST explanation: The treatment of water with the ozone IMPROVES the TASTE of the water and the bed of ACTIVATED carbon removes the colour.

Discussion

121.	When two solutions of the different concentration are separated by the semi permeable membrane then the solvent flows from low to higher concentration is called osmosis.(a) True(b) FalseI had been asked this question in final exam.This intriguing question comes from Reverse Osmosis, Ultrafilteration, COD and BOD in portion Water of Applied Chemistry
Answer» Correct option is (a) True For explanation: Always the energy flows from lower to HIGHER concentration. When TWO solutions of the different concentration is SEPARATED by the semi permeable membrane then the solvent flows from low to higher concentration is called OSMOSIS.

Discussion

122.	50 ml of standard and hard water containing 1mg of pure CaCO3 per ml consumed 10ml of EDTA solution. 50ml of given EDTA sample requires 10ml of same EDTA solution. Calculate the total hardness of water sample in ppm.(a) 10ppm(b) 100ppm(c) 1000ppm(d) 10000ppmThe question was posed to me in semester exam.My doubt stems from Problems, Units and Formulae in chapter Water of Applied Chemistry
Answer» The correct option is (C) 1000ppm The BEST I can explain: 50ml of standard HARD water requires 10ml of EDTA solution so 1ml of standard water requires 5ml of EDTA solution. So, 50ml of water sample requires 10ml of EDTA solution. So, 50ml of water sample requires 50mg of CaCO3. So, 1000ml of water sample requires 50*(1000/50)=1000 mg of CaCO3 that is 1000ppm.

Discussion

123.	What is the full form of BOD?(a) Biochemical oxygen demand(b) Biological oxygen demand(c) Biometric oxygen deep water(d) Biological oxygen deep waterThis question was addressed to me in an internship interview.The query is from Types of Water Pollutants and Effects in chapter Water of Applied Chemistry
Answer» Correct choice is (a) BIOCHEMICAL oxygen demand The EXPLANATION is: The BOD is the FULL form biochemical oxygen demand. The amount of oxygen is taken as the MEASURE of the quantity of organic matter is called as the BOD.

Discussion

124.	If a sample water has not supplied any heat and having impurities as follows: Mg(HCO3)2=50 mg of CaCO3, MgSO4 = 100mg of CaCO3, CaCl2=200mg of CaCO3, Ca(NO3)2=100mg of CaCO3. Calculate the lime required for treatment of 10000 litres of water.(a) 1.82Kg(b) 1.50Kg(c) 1.45Kg(d) 1.48KgI have been asked this question at a job interview.I need to ask this question from Problems, Units and Formulae in chapter Water of Applied Chemistry
Answer» Right option is (d) 1.48Kg The BEST explanation: Lime NEEDED is 0.74[temp Ca HARDNESS+temp of MG hardness+perm Mg hardness]. So, 0.74(0+250+100)=148mg/litre. Lime REQUIREMENT for 10000 litres of water is 14810000mg=1.48Kg.

Discussion

125.	In ion exchange process, the cation exchange resin is generated by passing ____________(a) Acids(b) Dilute acids(c) Alkalis(d) Dilute alkalisI have been asked this question by my school teacher while I was bunking the class.This interesting question is from Ion Exchange Process topic in chapter Water of Applied Chemistry
Answer» The CORRECT answer is (B) Dilute acids To elaborate: In ion EXCHANGE process, the cation exchange resin is GENERATED by passing the dilute acids. The anion exchange resin is generated by passing ALKALI.

Discussion

126.	How many types of absorbed impurities in water are there mainly?(a) 2(b) 3(c) 4(d) 5The question was asked during an internship interview.Query is from Sources, Impurities and Hardness of Water in chapter Water of Applied Chemistry
Answer» Correct answer is (C) 4 The best EXPLANATION: There are FOUR types of impurities in water are there. They are suspended impurities, dissolved gases, dissolved mineral salts and bacterial impurities.

Discussion

127.	The colour and odour of the natural water is due to the presence of the ___________(a) Dissolved organic matter(b) Mud(c) Leaves(d) Other dust particlesThis question was addressed to me in an interview for internship.I want to ask this question from Sources, Impurities and Hardness of Water topic in portion Water of Applied Chemistry
Answer» CORRECT CHOICE is (a) Dissolved organic matter Easy explanation: The colour and odour of the natural water is due to the presence of the dissolved organic matter. Dissolved gases LIKE nitrogen, oxygen and CARBONDIOXIDE are present in lake water.

Discussion

128.	COD is the short form of the chemical oxygen demand.(a) True(b) FalseThe question was asked in an international level competition.This interesting question is from Types of Water Pollutants and Effects in portion Water of Applied Chemistry
Answer» The correct answer is (a) True For explanation: COD is the SHORT form of the chemical oxygen demand. The TOTAL ORGANIC content present in water is determined in another parameter called COD.

Discussion

129.	The natural tendency of the water can be reversed by applying ________ to the salty water part.(a) Low pressure(b) High pressure(c) Low temperature(d) High temperatureThe question was asked in examination.I'm obligated to ask this question of Reverse Osmosis, Ultrafilteration, COD and BOD topic in section Water of Applied Chemistry
Answer» Correct CHOICE is (b) High pressure To explain: The natural tendency of the water can be REVERSED by APPLYING the high pressure with a PISTON to the salty part of the water.

Discussion

130.	Helminth in the water causes __________(a) Hook worm(b) Amoebic dysentery(c) Cholera(d) TyphoidI got this question during an interview.Question is from Types of Water Pollutants and Effects topic in division Water of Applied Chemistry
Answer» Right choice is (a) Hook worm For explanation: Helminth in the WATER CAUSES the hook worm and also the GUINEA worm in the person. Amoebic DYSENTERY is caused by the protozoa and cholera and typhoid is caused by the bacteria in water.

Discussion

131.	NaOH formed during zeolite process is reacts with _________ at high temperatures causing the corrosions of boilers.(a) Iron(b) Manganese(c) Magnesium(d) CobaltI got this question during an interview.Asked question is from Permutit’s Process topic in division Water of Applied Chemistry
Answer» The correct option is (a) Iron To explain: NaOH FORMED during the ZEOLITE PROCESS REACTS with the iron at HIGH temperature during the process that leads to the corrosion of the boilers.

Discussion

132.	__________ water is not suitable for zeolite process, as it affects the mineral.(a) Highly acidic(b) Highly alkaline(c) Highly acidic and alkaline(d) Neither highly acidic nor alkalineI have been asked this question during an interview.This question is from Permutit’s Process topic in division Water of Applied Chemistry
Answer» Right answer is (c) HIGHLY acidic and alkaline To explain I would SAY: The highly acidic or alkaline water is not SUITABLE for ZEOLITE process, as it affects the mineral. It is one of the LIMITATIONS of this process.

Discussion

133.	The change in colour is sharper at the PH of ________(a) 5(b) 10(c) 15(d) 20This question was posed to me in a job interview.Asked question is from Estimation of Hardness in section Water of Applied Chemistry
Answer» CORRECT ANSWER is (b) 10 To explain I would SAY: The CHANGE in the COLOUR of the ions is sharper at the PH of the 10 than that of the other ranges of the PH.

Discussion

134.	The colour of dye metal complex and dye are ___________(a) Same(b) Different(c) Same in only some cases(d) Cannot be knownI had been asked this question during an internship interview.Enquiry is from Estimation of Hardness in section Water of Applied Chemistry
Answer» Right option is (b) Different The best explanation: The COLOUR of DYE metal complex and dye are different. EDTA extracts the metal ions from the metal ion dye to form STABLE complex.

Discussion

135.	The suspended impurities is negligible due to the filtering action of __________(a) Water plants(b) Dissolved impurities(c) Soil(d) Dissolved gasesI had been asked this question in exam.My question is based upon Sources, Impurities and Hardness of Water topic in division Water of Applied Chemistry
Answer» The correct ANSWER is (c) Soil For explanation I would SAY: The suspended impurities are negligible due to the filtering action of the soil. The soil filters all the suspended impurities like silica and IRON HYDROXIDE.

Discussion

136.	The biochemical oxygen demand can be given by ___________(a) (Dob – Dos)+dilution factor(b) (Dob – Dos)-dilution factor(c) (Dob – Dos)/dilution factor(d) (Dob – Dos)*dilution factorThis question was addressed to me in unit test.This interesting question is from Problems, Units and Formulae topic in portion Water of Applied Chemistry
Answer» The correct choice is (d) (DOB – Dos)dilution factor Explanation: The BIOCHEMICAL oxygen DEMAND can be given by (Dob – Dos)dilution factor where Dob = dissolved oxygen present in blank Dos = dissolved oxygen of SEWAGE after incubation.

Discussion

137.	The ppm is one part of calcium carbonate equivalent hardness is present in __________ of water.(a) One(b) One million(c) One billion(d) One trillionThis question was addressed to me by my college professor while I was bunking the class.My question comes from Problems, Units and Formulae topic in chapter Water of Applied Chemistry
Answer» RIGHT option is (B) One million Easy EXPLANATION: The ppm is one part of calcium carbonate equivalent HARDNESS is present in the one million parts of water.

Discussion

138.	Mostly pollution of rivers takes place by discharge sewage.(a) True(b) FalseThis question was posed to me during an interview.My doubt is from Monitoring and Control of Water Pollution in chapter Water of Applied Chemistry
Answer» CORRECT option is (a) True Easy EXPLANATION: Mostly, the pollution of the river takes place by discharge of sewage in WATER or by releasing the industrial WASTES into the RIVERS.

Discussion

139.	COD values are always _________ BOD.(a) Less than(b) Higher than(c) Equal(d) Nearly equalI had been asked this question by my school principal while I was bunking the class.My question is based upon Reverse Osmosis, Ultrafilteration, COD and BOD in chapter Water of Applied Chemistry
Answer» RIGHT choice is (b) HIGHER than Explanation: COD values are ALWAYS greater than that of the BOD values because the organic and the biologically oxidisable materials are oxidised in COD.

Discussion

140.	By ultra filtration aldrin can be removed by _________(a) 100%(b) 99%(c) 98%(d) 97%This question was posed to me in class test.Asked question is from Reverse Osmosis, Ultrafilteration, COD and BOD in chapter Water of Applied Chemistry
Answer» RIGHT answer is (b) 99% Best EXPLANATION: By ultra filtration process, many MICRO organisms can be removed by reacting the industrial waste with activated charcoal. ALDRIN can be removed by 99%.

Discussion

141.	Water softened during __________ method will be ideal in boilers.(a) Zeolite method(b) Lime soda method(c) Demineralisation method(d) Permutit’s processThe question was asked in an international level competition.This question is from Ion Exchange Process in division Water of Applied Chemistry
Answer» CORRECT answer is (b) LIME soda method For explanation I would SAY: Water SOFTENED during the demineralisation method is completely free from all the impurities and flaws. So, the water after the softening by this method will be ideal for boilers.

Discussion

142.	Zeolite process cannot soften _________(a) Basic water(b) Neutral water(c) Acidic water(d) Salt waterI got this question in a national level competition.The origin of the question is Permutit’s Process in portion Water of Applied Chemistry
Answer» The correct answer is (c) ACIDIC WATER Easiest explanation: ZEOLITE PROCESS cannot soften the acidic water. After the process, the sodium salts are not useful for the boiler USE.

Discussion

143.	The amount of coagulate if added in the hot lime soda process is __________(a) High(b) Low(c) Very high(d) Very lowI have been asked this question in an international level competition.My question is from Lime Washing Soda Method in section Water of Applied Chemistry
Answer» CORRECT answer is (d) Very low Easiest explanation: The amount of coagulate if added in the hot LIME soda PROCESS is very low. The CHEMICAL reaction takes place faster and PRECIPITATION takes place faster.

Discussion

144.	The chloride in drinking water range can be about ___________(a) 200-600ppm(b) 300-600ppm(c) 400-600ppm(d) 500-600ppmThe question was posed to me in quiz.My question is from Estimation of Hardness in division Water of Applied Chemistry
Answer» RIGHT option is (a) 200-600ppm Explanation: The chloride in drinking water RANGE can be about 200-600ppm. The NITRATE is about the range of 45ppm in drinking water.

Discussion

145.	Which of the following is the suspended impurity?(a) Iron hydroxide(b) Dust(c) Mud(d) NitrogenThe question was asked during an interview for a job.The doubt is from Sources, Impurities and Hardness of Water in section Water of Applied Chemistry
Answer» The CORRECT answer is (a) Iron HYDROXIDE For EXPLANATION: The nitrogen is the DISSOLVED impurity. The suspended impurities are iron hydroxide, silica are the inorganic impurities which decomposes the organic impurities.

Discussion

146.	The quantity of water available for the actual use is _________(a) 10%(b) 5%(c) 0.5%(d) 1%I got this question in quiz.Query is from Sources, Impurities and Hardness of Water in portion Water of Applied Chemistry
Answer» Right CHOICE is (c) 0.5% Best explanation: The quantity of water available on the earth’s crust is about 80% and the quantity of water available for actual USE that is in the form of RIVERS, TANKS is about 0.5%.

Discussion

147.	100 parts of CaCO3 is equivalent to the __________ parts of sodium carbonate.(a) 103(b) 104(c) 105(d) 106I have been asked this question in class test.I need to ask this question from Problems, Units and Formulae topic in chapter Water of Applied Chemistry
Answer» Right CHOICE is (d) 106 Easiest explanation: 100 parts of CaCO3 is EQUIVALENT to the 106 parts of the sodium carbonate. So, the washing SODA REQUIREMENT is 100/106{temp Ca hardness+2.Mg hardness+perm(Mg+Fe+3Al)hardness+1/2 HCL+H2SO4-NaAlO2-CO2} .

Discussion

148.	Reacting the water with _________ removes the odour due to the phenols.(a) KMnO4(b) MnO4(c) Potassium(d) MagnesiumThe question was posed to me at a job interview.This interesting question is from Biological Oxidation Process in division Water of Applied Chemistry
Answer» Correct OPTION is (a) KMnO4 The explanation: The chlorination of water and REACTING the water with the POTASSIUM permanganate removes the odour of water DUE to phenols.

Discussion

149.	In the trickling filter process, the _________ build up and they block the passage.(a) Sludge formed(b) Dissolved impurities(c) Dissolved solids(d) Micro organismsThe question was posed to me in my homework.This interesting question is from Biological Oxidation Process in division Water of Applied Chemistry
Answer» Right option is (d) MICRO organisms To elaborate: The micro ORGANISM built up and they block the passage and then the rate of FLOW DROPS considerably.

Discussion

150.	By aerobic process _________ of biodegradable water is converted into the biomass.(a) 10%(b) 30%(c) 50%(d) 75%I had been asked this question during an online interview.I'm obligated to ask this question of Methods of Reducing Water Pollution in chapter Water of Applied Chemistry
Answer» The correct option is (C) 50% To explain: By aerobic process the 50% of the biodegradable WATER is converted into the biomass and the REMAINING 50% into CARBONDIOXIDE.

Discussion

Explore topic-wise InterviewSolutions in .

___________ can be used for the turbid water.(a) Soap titration process(b) Zeolite process(c) Ion exchange process(d) Lime soda processThis question was addressed to me in an interview for job.This interesting question is from Lime Washing Soda Method topic in section Water of Applied Chemistry

In ion exchange process, the iron and manganese ions are removed from the water.(a) True(b) FalseThis question was addressed to me during a job interview.This is a very interesting question from Ion Exchange Process topic in chapter Water of Applied Chemistry

The indicator used in the EDTA method is ___________(a) Benzene(b) Phenopthalene(c) Ethylene diamine(d) Erichrome black TThe question was posed to me in an interview for internship.The origin of the question is Estimation of Hardness in portion Water of Applied Chemistry

EDTA method is also called as _________(a) Complexometric titration(b) Complex titration(c) Complement titration(d) Complexion titrationI have been asked this question during an interview.My question is based upon Estimation of Hardness in division Water of Applied Chemistry

All carbonate and bicarbonates are _________(a) Alkaline(b) Acidic(c) Highly acidic(d) NeutralThe question was posed to me in homework.I'm obligated to ask this question of Estimation of Hardness topic in section Water of Applied Chemistry

The hardness of moderately hard water is about _____________(a) 75-150ppm(b) 75-120ppm(c) 75-130ppm(d) 75-100ppmI got this question in an internship interview.The question is from Estimation of Hardness in section Water of Applied Chemistry

Well water in wells located in the areas of oil and gases will contain __________(a) Ethane(b) Methane(c) Carbon(d) NitrogenI have been asked this question in unit test.My question is taken from Sources, Impurities and Hardness of Water topic in chapter Water of Applied Chemistry

Dried sludge can be used as _________(a) Fertilizer(b) Pesticide(c) Reagent(d) MedicineThis question was addressed to me in an online quiz.The above asked question is from Biological Oxidation Process topic in section Water of Applied Chemistry

The depth of the rectangular circular tanks in the trickling filters method is having the depth of ____________(a) 4m(b) 3m(c) 2m(d) 1mThe question was posed to me in an international level competition.My question comes from Biological Oxidation Process topic in portion Water of Applied Chemistry

Trickling filter method is ___________ than the activated sludge process.(a) Fast(b) Slow(c) Very fast(d) ModerateI got this question in an internship interview.My question is based upon Biological Oxidation Process in chapter Water of Applied Chemistry

The BOD value of industrial waste must be about _________(a) 100(b) 200(c) 300(d) 400I had been asked this question in an international level competition.My doubt stems from Methods of Reducing Water Pollution topic in section Water of Applied Chemistry

In domestic water treatment, after the primary treatment _________ is done.(a) Screening(b) Sedimentation(c) Aerobic process(d) Anaerobic processThe question was asked in exam.The question is from Methods of Reducing Water Pollution topic in section Water of Applied Chemistry

Non hazardous organic wastes from the sewage is to be separated from the ___________(a) Toxic industrial wastes(b) Bacteria(c) Helminth(d) ProtozoaThis question was addressed to me in an interview.Enquiry is from Methods of Reducing Water Pollution in portion Water of Applied Chemistry

___________ water contains more soluble salts than the surface water.(a) Sea water(b) Rain water(c) Underground water(d) Tank waterI got this question in class test.This intriguing question comes from Sources, Impurities and Hardness of Water topic in portion Water of Applied Chemistry

EDTA has the ability to form _________ with metal ions.(a) Stable complexes(b) Unstable complexes(c) Salts(d) AcidsThe question was asked by my college professor while I was bunking the class.My question comes from Estimation of Hardness topic in chapter Water of Applied Chemistry

The treatment of water with _________ improves the taste of water.(a) Oxygen(b) Chlorine(c) KMnO4(d) OzoneI had been asked this question during an online interview.This question is from Biological Oxidation Process in division Water of Applied Chemistry

How many types of absorbed impurities in water are there mainly?(a) 2(b) 3(c) 4(d) 5The question was asked during an internship interview.Query is from Sources, Impurities and Hardness of Water in chapter Water of Applied Chemistry

COD is the short form of the chemical oxygen demand.(a) True(b) FalseThe question was asked in an international level competition.This interesting question is from Types of Water Pollutants and Effects in portion Water of Applied Chemistry

Helminth in the water causes __________(a) Hook worm(b) Amoebic dysentery(c) Cholera(d) TyphoidI got this question during an interview.Question is from Types of Water Pollutants and Effects topic in division Water of Applied Chemistry

NaOH formed during zeolite process is reacts with _________ at high temperatures causing the corrosions of boilers.(a) Iron(b) Manganese(c) Magnesium(d) CobaltI got this question during an interview.Asked question is from Permutit’s Process topic in division Water of Applied Chemistry

The change in colour is sharper at the PH of ________(a) 5(b) 10(c) 15(d) 20This question was posed to me in a job interview.Asked question is from Estimation of Hardness in section Water of Applied Chemistry

The colour of dye metal complex and dye are ___________(a) Same(b) Different(c) Same in only some cases(d) Cannot be knownI had been asked this question during an internship interview.Enquiry is from Estimation of Hardness in section Water of Applied Chemistry

The suspended impurities is negligible due to the filtering action of __________(a) Water plants(b) Dissolved impurities(c) Soil(d) Dissolved gasesI had been asked this question in exam.My question is based upon Sources, Impurities and Hardness of Water topic in division Water of Applied Chemistry

Mostly pollution of rivers takes place by discharge sewage.(a) True(b) FalseThis question was posed to me during an interview.My doubt is from Monitoring and Control of Water Pollution in chapter Water of Applied Chemistry

COD values are always _________ BOD.(a) Less than(b) Higher than(c) Equal(d) Nearly equalI had been asked this question by my school principal while I was bunking the class.My question is based upon Reverse Osmosis, Ultrafilteration, COD and BOD in chapter Water of Applied Chemistry

By ultra filtration aldrin can be removed by _________(a) 100%(b) 99%(c) 98%(d) 97%This question was posed to me in class test.Asked question is from Reverse Osmosis, Ultrafilteration, COD and BOD in chapter Water of Applied Chemistry

Water softened during __________ method will be ideal in boilers.(a) Zeolite method(b) Lime soda method(c) Demineralisation method(d) Permutit’s processThe question was asked in an international level competition.This question is from Ion Exchange Process in division Water of Applied Chemistry

Zeolite process cannot soften _________(a) Basic water(b) Neutral water(c) Acidic water(d) Salt waterI got this question in a national level competition.The origin of the question is Permutit’s Process in portion Water of Applied Chemistry

The amount of coagulate if added in the hot lime soda process is __________(a) High(b) Low(c) Very high(d) Very lowI have been asked this question in an international level competition.My question is from Lime Washing Soda Method in section Water of Applied Chemistry

The chloride in drinking water range can be about ___________(a) 200-600ppm(b) 300-600ppm(c) 400-600ppm(d) 500-600ppmThe question was posed to me in quiz.My question is from Estimation of Hardness in division Water of Applied Chemistry

Which of the following is the suspended impurity?(a) Iron hydroxide(b) Dust(c) Mud(d) NitrogenThe question was asked during an interview for a job.The doubt is from Sources, Impurities and Hardness of Water in section Water of Applied Chemistry

The quantity of water available for the actual use is _________(a) 10%(b) 5%(c) 0.5%(d) 1%I got this question in quiz.Query is from Sources, Impurities and Hardness of Water in portion Water of Applied Chemistry

100 parts of CaCO3 is equivalent to the __________ parts of sodium carbonate.(a) 103(b) 104(c) 105(d) 106I have been asked this question in class test.I need to ask this question from Problems, Units and Formulae topic in chapter Water of Applied Chemistry

Reacting the water with _________ removes the odour due to the phenols.(a) KMnO4(b) MnO4(c) Potassium(d) MagnesiumThe question was posed to me at a job interview.This interesting question is from Biological Oxidation Process in division Water of Applied Chemistry

By aerobic process _________ of biodegradable water is converted into the biomass.(a) 10%(b) 30%(c) 50%(d) 75%I had been asked this question during an online interview.I'm obligated to ask this question of Methods of Reducing Water Pollution in chapter Water of Applied Chemistry