Practice question
Question
A first-order reaction is 25% complete in 15 minutes. What is the rate constant in min^{-1 ?
Explanation
Given:
A first-order reaction is 25% complete in 15 minutes. What is the rate constant in min^{-1 ?
Formula:
25% complete, 75% remains: frac[R]_0[R] = 100/75 = 1.333.
Substitution & Calculation:
k = 2.303/t log frac[R]_0[R] = 2.303/15 log 1.333 = 0.0192 min^{-1 .
Final Result:
The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.
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