CUET · CHEMISTRY · PYQ PAPER 2025
The aqueous solutions of \(ZnSO _4, AgNO _3, FeCl _3\) and \(WCl _6\) are electrolysed for 2 hours using a current of 5 amperes. The decreasing order of mass deposited of the following metals at the cathode will be:
(A) Zn
(B) Ag
(C) Fe
(D) W
(Atomic masses:\(Fe =56 g mol ^{-1}, Zn =65 g mol ^{-1}\),\(\left.Ag =108 g mol ^{-1}, W=184 g mol ^{-1}\right)\)
Choose the correct answer from the options given below:
- A (A), (B), (C), (D)
- B (A), (B), (D), (C)
- C (B), (A), (D), (C)
- D (C), (D), (B), (A)
Answer & Solution
Correct Answer
(C) (B), (A), (D), (C)
Step-by-step Solution
Detailed explanation
\(I = 5 \text{ A}\) \(t = 2 \text{ h} = 7200 \text{ s}\) \(F = 96485 \text{ C mol}^{-1}\) Mass deposited \(m = \frac{\text{Molar mass} \times I \times t}{\text{Valency} \times F}\) For Ag (\(M=108, n=1\)):…
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