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CUET · CHEMISTRY · PYQ PAPER 2025

Arrange the following reactions in increasing order of the value of the ratio of rate constants \(\left(\frac{k_{310}}{k_{300}}\right)\)
\((A): A + B \rightarrow C , E_g=70 kJ mol ^{-1}\)
(B) : \(P + Q \rightarrow R , E_g=45 kJ mol ^{-1}\)
\((C): G + H \rightarrow I , E_g=95 kJ mol ^{-1}\)
(D): \(X + Y \rightarrow Z , E_g=100 kJ mol ^{-1}\)
Choose the correct answer from the options given below :

  1. A \(( A ),( B ),( C ),( D )\)
  2. B (B), (A), (C), (D)
  3. C \(( D ),( C ),( A ),( B )\)
  4. D (C), (B), (D), (A)
Verified Solution

Answer & Solution

Correct Answer

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

Step-by-step Solution

Detailed explanation

\(\frac{k_{T_2}}{k_{T_1}} = e^{\frac{E_a}{R}\left(\frac{1}{T_1} - \frac{1}{T_2}\right)}\) For \(T_1 = 300 K\) and \(T_2 = 310 K\), \(\frac{k_{310}}{k_{300}} = e^{\frac{E_a}{R}\left(\frac{1}{300} - \frac{1}{310}\right)}\). The ratio \(\left(\frac{k_{310}}{k_{300}}\right)\)…