Exams › JEE Advanced › Chemistry
Statement I: In electrolysis, the quantity of electricity required to deposit 1 mole of silver is different from that required to deposit 1 mole of copper. Because Statement II: The molecular (molar) masses of silver and copper are different.
- Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
- Statement I is true; Statement II is true; Statement II is NOT the correct explanation of Statement I.
- Statement I is true; Statement II is false.
- Statement I is false; Statement II is true.
Correct answer: Statement I is true; Statement II is false.
Solution
Statement I is TRUE: 1 mole of Ag (Ag+) requires 1 F = 96500 C, while 1 mole of Cu (Cu2+) requires 2 F = 193000 C. They are indeed different. Statement II claims this is because their molecular weights differ; this is FALSE. The difference arises because of different valencies (ionic charges): Ag carries charge +1, Cu carries charge +2. Molar mass is irrelevant to this comparison. Hence Statement I true, Statement II false.
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