CUET · CHEMISTRY · PYQ PAPER 2023

The rate constant for a reaction \(\text{P} \rightarrow \text{Q}\) is \(0.8 \times 10^{-3} \text{ mol L}^{-1} \text{ s}^{-1}\).
If the concentration of P is 10 M, then the concentration of Q after 40 minutes is:

A \(1.92 \text{ mol L}^{-1}\)
B \(1.46 \text{ mol L}^{-1}\)
C \(1.23 \text{ mol L}^{-1}\)
D \(0.24 \text{ mol L}^{-1}\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(1.92 \text{ mol L}^{-1}\)

Step-by-step Solution

Detailed explanation

Reaction is zero order based on rate constant units. \(t = 40 \text{ min} \times 60 \text{ s/min} = 2400 \text{ s}\) \([Q]_t = kt = (0.8 \times 10^{-3} \text{ mol L}^{-1} \text{ s}^{-1}) \times (2400 \text{ s}) = 1.92 \text{ mol L}^{-1}\)

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 (Reaction)	List-II (Name)
(A) \({CH}_3 {CHO}+{Dil} {NaOH} \longrightarrow {CH}_3 {CHOHCH}_2 {CHO}\)	(I) Aldol Reaction
(B) \({CH}_3 {CH}_3 {CH}_2 {COOH}+{Br}_2 \xrightarrow[\text { (ii) } {H}_2 {O}]{\text { (i)Red P }} {CH}_2 {CH}_2 {CHBrCOOH}\)	(II) Cannizzaro Reaction
(C) \({C}_6 {H}_5 {CHO}+\) Conc. \({KOH} \longrightarrow {C}_6 {H}_5 {COONa}+{C}_6 {H}_5 {CH}_2 {OH}\)	(III) Haloform Reaction
(D) \({CH}_3 {COCH}_3 \xrightarrow{{NaOCl}} {CH}_3 {COONa}+{CHCl}_3\)	(IV) Hell Volhard Zelinski Reaction

Choose the correct answer from the options given below:

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List - I	List - II
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The rate constant for a reaction \(\text{P} \rightarrow \text{Q}\) is \(0.8 \times 10^{-3} \text{ mol L}^{-1} \text{ s}^{-1}\).If the concentration of P is 10 M, then the concentration of Q after 40 minutes is:

Step-by-step Solution

The rate constant for a reaction \(\text{P} \rightarrow \text{Q}\) is \(0.8 \times 10^{-3} \text{ mol L}^{-1} \text{ s}^{-1}\).
If the concentration of P is 10 M, then the concentration of Q after 40 minutes is: