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For a reaction, activation energy Eₐ = 0 and the rate constant at 200 K is 1.6 × 10⁶ s⁻¹. The rate constant at 400 K will be [NEET 2019 data Given that gas constant, R = 8.314 J K⁻¹ mol⁻¹]

1. 3.2 × 10⁶ s⁻¹
2. 3.2 × 10⁴ s⁻¹
3. 1.6 × 10⁶ s⁻¹
4. 1.6 × 10³ s⁻¹

Correct answer: 1.6 × 10⁶ s⁻¹

Solution

Since the activation energy (Eₐ) is 0, the rate constant (k) is independent of temperature. Therefore, the rate constant at 400 K will remain the same as at 200 K, i.e., 1.6 × 10⁶ s⁻¹.

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