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CUET · CHEMISTRY · PYQ PAPER 2025

Read the passage carefully and answer the Questions
The decomposition of \(N_2O_5\ (g)\) is given as
\(N_2O_5(g) \rightarrow 2NO_2(g) + \frac{1}{2}O_2(g)\)
The above reaction is found to be of first order.
Predict the intercept for the plot of \(log \frac{[N_2O_5]_0}{[N_2O_5]}\) versus time

  1. A \(2.303\ k\)
  2. B \(2.303/k\)
  3. C zero
  4. D \(k/2.303\)
Verified Solution

Answer & Solution

Correct Answer

(C) zero

Step-by-step Solution

Detailed explanation

\(\ln \frac{[N_2O_5]_0}{[N_2O_5]} = kt\) \(2.303 \log \frac{[N_2O_5]_0}{[N_2O_5]} = kt\) \(\log \frac{[N_2O_5]_0}{[N_2O_5]} = \frac{k}{2.303} t\) The plot of \(\log \frac{[N_2O_5]_0}{[N_2O_5]}\) versus time is a straight line passing through the origin. Intercept = zero
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