CUET · CHEMISTRY · PYQ PAPER 2025
The rate constant, activation energy and the Arrhenius parameter at \(27^{\circ} C\) are \(2.0 \times 10^{-5} s^{-1}, 100 kJ mol ^{-1}\) and \(6.0 \times 10^{14} s^{-1}\) respectively.
The value of the rate constant at a very high temperature \((T \rightarrow \infty)\) approaches to:
- A \(2.0 \times 10^{-5} s^{-1}\)
- B Infinite
- C \(6.0 \times 10^{14} s^{-1}\)
- D \(4 \times 10^{-5} s^{-1}\)
Answer & Solution
Correct Answer
(A) \(2.0 \times 10^{-5} s^{-1}\)
Step-by-step Solution
Detailed explanation
\(k = A e^{-E_a / RT}\) As \(T \rightarrow \infty\), \(-E_a / RT \rightarrow 0\). \(k \rightarrow A e^0 = A\) \(k = 6.0 \times 10^{14} s^{-1}\)
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