Unit10 Electrochemistry qns

Unit10 Electrochemistry qns - 1 UNIT 10 ELECTRO CHEMISTRY...

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1 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 UNIT 10 ELECTRO CHEMISTRY ELECTROLYSIS 1. Which pure substance will not conduct electricity ? (a) molten NaCl (b) molten KOH (c) liquified HCL (d) liquid Hg 2. The Cathode of an electrolysis appartus resembles a reducing agent because both (a) are metals (b) supply electrons (c) remove electrons (d) absorb electrons 3. 1 mole of electrons is the same as (a) ampere-second (b) coulomb (c) unit-charge (d) faraday 4. The electrolysis of an aqueous brine solution in Nelson cell will produce (a) Na and Cl 2 (b) NaOH , H 2 ,Cl 2 (c) NaCl, NaClO 3 , H 2 O (d) NaOH, O 2 ,Cl 2 5. Most active metal are extracted from their ores by the process of reduction (a) with Al (b) with carbon (c) with H 2 (d) by electolysis 6. How many electrons are there in one coulomb ? (a) 6.0 × 10 –28 (a) 6.0 × 10 –18 (a) 6.0 × 10 –23 (a) 6.0 × 10 –21 7. How many electrons are gained by one gram Cu 2+ ion as the result of electrolysis ? Cu =63.5 (a) 1.2 × 10 24 (a) 1.90 × 10 22 (a) 1.90 × 10 21 (a) 1.2 × 10 22 8. How many moles each of Ag + ion, Cu 2+ ion, Fe 3+ ions would be deposited by passage of same of electricity through solutions of their salts? (a) same number of moles of each (b) 1 : ½ :1/3 (c) 1/3 : ½ : 1 (d) none of these 9. How many atom of calcium will be deposited from a asolution of CaCl 2 bya current of 25 milliamperes following for 60 seconds ? (a) 9.36 × 10 18 (b) 4.68 × 10 18 (c) 2.34 × 10 18 (d) 1.2 × 10 23 10. How many minutes would be required to deposit the cooper in 500 ml 0.25 N CuSO 4 by acurrent of 75 milli-ampers? (a) 1340 (b) 2680 (c) 5360 (d) none of these 11. If 31.75 g of Cus are deposited by 1F of electricity from CuSO 4 solution, what weight of Cu, Ag and Sb will be deposited respectively by same quantity of electricity when passed through solution of CuCl, AgNO 3 and SbCl 3 ? (Cu = 63.5, Ag=108, Sb=121.77) (a) 63.5, 108,70.59 (b) 31.75, 108, 121.77 (c) equal weights of all (d) 31.75, 108, 40.7 12. How long will it take for a current of 3 amperes to decompose 36 g of water ? (a) 36 hours (b) 18 hours (c) 9 hours (d) 4.5 hours 13. The number of electrons required to deposit one g-equivalent of Al from a solution of AlCl 3 is (a) N (b) 2N (c) 3B (d) N/9 (N=6.0 × 10 23 ) 14. Three faradays of electricity are passed through molten Al 2 O 3 aqueous solutions of CuSO 4 and molten NaCl solutions. The
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2 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 amounts of Al, Cu And Na deposited at the cathodes will be in the ratio of moles indicated. (a) 1, 2, 3 (b) 1, 5, 2, 3 (c) 1, 1.5, 3 (d) 1, 3, 2 15. How many atom of Cu are deposited from a solution of CuSO 4 by current of 1 ampere in one second ? (a) 3.12
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This note was uploaded on 10/05/2011 for the course CHEM 1201 taught by Professor Darcy during the Spring '11 term at St. Mary NE.

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Unit10 Electrochemistry qns - 1 UNIT 10 ELECTRO CHEMISTRY...

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