CUET · CHEMISTRY · PYQ PAPER 2025

While charging the lead storage battery......

A \(PbSO _4\) on anode is reduced to Pb
B \(PbSO _4\) on cathode is reduced to Pb
C \(PbSO _4\) on anode is oxidized to Pb
D \(PbSO _4\) on cathode is oxidized to Pb

Verified Solution

Answer & Solution

Correct Answer

(B) \(PbSO _4\) on cathode is reduced to Pb

Step-by-step Solution

Detailed explanation

\(PbSO _4\) on cathode is reduced to Pb

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.

Same subject

Match List-I with List-II

List-I	List-II
(A) Tetracarbonylnickel(0)	\((I)\) \(\left[ CoCl _2(e n)_2\right]^{+}\)
(B) Tetraammineaquachloridocobalt (III)	chloride \((I I) K _2\left[ Zn ( OH )_4\right]\)
(C) Potassium tetrahydroxidozincate(II)	\((III)\) \(\left[ Co \left( NH _3\right)_4\left( H _2 O \right) Cl \right] Cl _2\)
(D) Dichloridobis(ethane-1,2-diamine)cobalt(III)	\((IV)\) \(\left[ Ni ( CO )_4\right]\)

Choose the correct answer from the options given below:

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Match List - I with List - II

List - I	List - II
(A) Impurity defect	(I) NaCl with anionic sites called F centres
(B) Metal excess defect	(II) FeO with Fe3+
(C) Metal deficiency defect	(III) Non ionic solids and density of solid decreases
(D) Simple vacancy defect	(IV) NaCl with Sr2+ and cationic sites vacant

Choose the correct answer from the options given below:

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If half life for a first order reaction of A is 2 minutes, how long will it take \([\text{A}]\) to reach 10% of its initial concentration?

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