CUET · CHEMISTRY · PYQ PAPER 2025

The units of rate of reaction and rate constant are identical for a

A Fractional order reaction
B Zero order reaction
C First order reaction
D Second order reaction

Verified Solution

Answer & Solution

Correct Answer

(B) Zero order reaction

Step-by-step Solution

Detailed explanation

Units of Rate \( = \text{mol L}^{-1} \text{s}^{-1} \) For zero order reaction: Rate \( = k \) Units of \( k = \text{mol L}^{-1} \text{s}^{-1} \) Therefore, units are identical for a Zero order reaction.

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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Match List-I with List-II

List-I (Structure of ether)	List-II (Common name)
(A) \(C_{6}H_{5}OCH_{2}CH_{3}\)	(I) Methyl n-propyl ether
(B) \(C_{6}H_{5}O(CH_{2})_{3}CH_{3}\)	(II) Methyl phenyl ether
(C) \(C_{6}H_{5}OCH_{3}\)	(III) n-Heptyl phenyl ether
(D) \(CH_{3}OCH_{2}CH_{2}CH_{3}\)	(IV) Ethyl phenyl ether
(D) \(CH_{3}OCH_{2}CH_{2}CH_{3}\)	(IV) Ethyl phenyl ether

Choose the correct answer from the options given below:

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Match List-I with List-II

List-I (Compound)	List-II (Use)
(A) Dichloromethane	(I) in the manufacturing of propellants for aerosol cans
(B) DDT	(II) in the production of the Freon refrigerant R-22
(C) Trichloromethane	(III) as a paint remover
(D) Tetrachloromethane	(IV) as an insecticide

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