Paper: CSIR-NET June 2015 · Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Chemical Kinetics – General · Marks: 2 · Difficulty: Medium
In a photochemical reaction, radicals formed according to the equation
If I is the intensity of light absorbed, the rate of the overall reaction is proportional to-
(a)I
(b)$\mathrm{I}^{1 / 2}$
(c)$I[\mathrm{C_4H_{10}}]$
(d)$I^{1/2}[\mathrm{C_4H_{10}}]^{1/2}$
Answer
Answer: A ✓ checked by 4AB · confidence medium
The source book printed D; on checking, A is correct — see the explanation.
Book printed (d).
Explanation
Steady state for C₂H₅: radicals are formed at a rate ∝ I and removed in pairs (rate ∝ [C₂H₅]²); the product-forming step therefore runs at a rate proportional to I (a).