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151.	Fishes can store more quantity of ___________ in their bodies.(a) Mercury(b) Bismuth(c) Palladium(d) ChlorineThis question was posed to me in an online quiz.My question comes from Types of Water Pollutants and Effects topic in division Water of Applied Chemistry
Answer» CORRECT option is (a) Mercury For explanation I WOULD SAY: Fishes can store more quantity of mercury. They can ALSO store lead and arsenic in their bodies.

152.	In zeolite process, only small amount of ________ ions can be removed.(a) Mn^++(b) Fe^++(c) Both Fe^++ and Mn^++(d) Neither Fe^++ nor Mn^++The question was posed to me in a national level competition.The origin of the question is Permutit’s Process topic in section Water of Applied Chemistry
Answer» The correct OPTION is (c) Both FE^++ and Mn^++ Best EXPLANATION: In zeolite process, only SMALL amount of the Fe^++ and Mn^++are removed. The total amount can be removed by USING the lime soda process.

153.	The cost of the lime soda process is _________(a) Less(b) High(c) Very high(d) ModerateThis question was posed to me in an interview.This intriguing question originated from Lime Washing Soda Method topic in division Water of Applied Chemistry
Answer» Right choice is (a) LESS The explanation is: The cost of the LIME soda PROCESS is less and the operational cost of the lime soda process is HIGH.

154.	The end point of the titration in the soap titration method is ___________(a) Formation of lather(b) Formation of salts(c) Formation of carbonates(d) Formation of bicarbonatesI have been asked this question in my homework.My doubt stems from Estimation of Hardness in chapter Water of Applied Chemistry
Answer» The CORRECT CHOICE is (a) Formation of LATHER Explanation: The end point of the TITRATION in the SOAP titration method is at the formation of lather that stands for about two minutes.

155.	The total hardness can be given by _________(a) Temporary + permanent hardness(b) Temporary – permanent hardness(c) Temporary * permanent hardness(d) Temporary/permanent hardnessI had been asked this question in an interview for internship.The query is from Estimation of Hardness in portion Water of Applied Chemistry
Answer» Correct choice is (a) Temporary + permanent HARDNESS For EXPLANATION: The sum of the temporary and permanent hardness of the WATER gives the TOTAL hardness of the water.

156.	The soft water contains the hardness of about ____________(a) 0-45ppm(b) 0-55ppm(c) 0-65ppm(d) 0-75ppmThe question was posed to me during an online interview.I'd like to ask this question from Estimation of Hardness topic in section Water of Applied Chemistry
Answer» The correct CHOICE is (d) 0-75ppm Best explanation: The soft water contains the hardness of about 0-75ppm. The hardness of water is mainly due to the salts of CALCIUM and MAGNESIUM.

157.	In determination of hardness by EDTA method, 50ml of standard hard water required 30ml of EDTA solution while 50ml of sample hard water consumed 20ml of EDTA solution. After boiling 50ml of same sample required 10ml of EDTA solution. Calculate the permanent hardness.(a) 322ppm(b) 332ppm(c) 664ppm(d) 644ppmThe question was asked in final exam.I would like to ask this question from Problems, Units and Formulae topic in chapter Water of Applied Chemistry
Answer» Right option is (B) 332ppm For explanation: For 50ml of boiled water requires the 10ML of EDTA solution that is 10(50/30) MG of CaCO3. The 1000ml of the boiled water requires the 10(50/30)*20=322mg of CaCO3. It MEANS permanent hardness is 322ppm.

158.	One French unit is equal to __________ ppm.(a) 10(b) 20(c) 30(d) 40I got this question in final exam.My question is based upon Problems, Units and Formulae topic in chapter Water of Applied Chemistry
Answer» The correct ANSWER is (a) 10 Explanation: One French unit is equal to the 10ppm. Hardness CAUSING salt as the number of PARTS of the substance by weight in million parts by weight of WATER is ppm.

159.	Which of the following method is not the method of desalination?(a) Reverse osmosis(b) Multi flash distillation(c) Electro dialysis(d) SmeltingThis question was addressed to me in a national level competition.Question is from Reverse Osmosis, Ultrafilteration, COD and BOD topic in chapter Water of Applied Chemistry
Answer» The CORRECT ANSWER is (d) SMELTING To explain: The reverse OSMOSIS, multi flash distillation and electro dialysis are the methods of desalination and smelting is not the PROCESS of desalination.

160.	In final step of the domestic water process, the effluent contain ___________ BOD.(a) 10ppm(b) 15ppm(c) 20ppm(d) 25ppmI had been asked this question during an online interview.Asked question is from Methods of Reducing Water Pollution topic in chapter Water of Applied Chemistry
Answer» Correct answer is (d) 25ppm The best EXPLANATION: The EFFLUENT obtained in the final STEP of the DOMESTIC WATER process contains ammonia ion and having the 25ppm.

161.	In the domestic water process, when air is sent during the active sludge, then _________ released.(a) Oxygen(b) Carbondioxide(c) Nitrogen(d) ChlorineI have been asked this question in an online interview.I'm obligated to ask this question of Methods of Reducing Water Pollution topic in chapter Water of Applied Chemistry
Answer» Correct answer is (b) CARBONDIOXIDE For explanation I would say: When the air is SENT during the ACTIVE SLUDGE, then the carbondioxide is released in domestic water PROCESS.

162.	Conductivity comes under the ___________ monitoring of the lake.(a) Physical(b) Chemical(c) Biological(d) OrganicThe question was asked by my school principal while I was bunking the class.This intriguing question originated from Monitoring and Control of Water Pollution topic in division Water of Applied Chemistry
Answer» Correct answer is (a) Physical The EXPLANATION is: The physical monitoring of lake INCLUDES the conductivity of the water. It ALSO includes turbidity, colour and TEMPERATURE of water.

163.	Waste water released from _________ are not the sources of bacteria.(a) Sanitaria(b) Municipalities(c) Tanning(d) IndustriesThe question was posed to me during an interview.My question comes from Types of Water Pollutants and Effects in section Water of Applied Chemistry
Answer» Right choice is (d) Industries To EXPLAIN: Waste water RELEASED from the sanitarias, municipalities, tanning and slaughtering PLANTS are the sources of the BACTERIA.

164.	The zeolite process can be __________(a) Can be operated pressure(b) Cannot be operated under pressure(c) Can be operated under pressure sometimes(d) Cannot be operated under pressure sometimesThe question was asked in class test.This key question is from Permutit’s Process topic in division Water of Applied Chemistry
Answer» Right answer is (a) Can be operated pressure To EXPLAIN I would say: The zeolite process has the best ADVANTAGE than any other PROCESSES that it can be operated under the pressure also.

165.	The total __________ are removed completely in the ion exchange process.(a) Dissolved gases(b) Dissolved solids(c) Dissolved solvents(d) Dissolved other impuritiesI got this question by my school teacher while I was bunking the class.The query is from Ion Exchange Process in section Water of Applied Chemistry
Answer» Right answer is (b) Dissolved solids To ELABORATE: The TOTAL dissolved solids are removed completely in the ion EXCHANGE process. In LIME soda process, the total dissolved solids are reduced only.

166.	To prepare EDTA solution _________ grams of EDTA is dissolved in the one litre of water.(a) 1(b) 2(c) 3(d) 4The question was asked in an international level competition.The doubt is from Estimation of Hardness topic in section Water of Applied Chemistry
Answer» Correct answer is (d) 4 The best I can explain: To prepare EDTA solution, four grams of the EDTA is DISSOLVED in the one litre of the WATER. This is the STANDARD EDTA solution used to determine the hardness of water.

167.	The very hard water has the hardness of CaCO3 is given by ___________(a) 100-200ppm(b) 100-300ppm(c) 200-300ppm(d) Above 300ppmThis question was posed to me during an interview.This intriguing question originated from Estimation of Hardness in portion Water of Applied Chemistry
Answer» CORRECT answer is (c) 200-300ppm To explain I would say: The very hard WATER has the hardness of CaCO3 is GIVEN about above 300ppm. The hard water is having the hardness of CaCO3 is given by 150-300ppm.

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