CUET · CHEMISTRY · PYQ PAPER 2025

Arrange the following in increasing order of the mass of the metal deposited when 1 amp of current is passed through their electrolytic solutions for 1 minute
(A). Al (atomic mass = 27 g/mol)
(B). Mg (atomic mass = 24 g/mol)
(C). Ag (atomic mass = 108 g/mol)
(D). Cu (atomic mass = 63.5 g/mol)
Choose the correct answer from the options given below:

A (A), (B), (C), (D)
B (A), (B), (D), (C)
C (Β), (A), (D), (C)
D (C), (B), (D), (A)

Verified Solution

Answer & Solution

Correct Answer

(B) (A), (B), (D), (C)

Step-by-step Solution

Detailed explanation

Given: \( m \propto \frac{\text{Atomic mass (M)}}{\text{Valency (n)}} \) For Al: \( \frac{M}{n} = \frac{27}{3} = 9 \) For Mg: \( \frac{M}{n} = \frac{24}{2} = 12 \) For Ag: \( \frac{M}{n} = \frac{108}{1} = 108 \) For Cu: \( \frac{M}{n} = \frac{63.5}{2} = 31.75 \) Increasing order…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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