For the reaction P+Q+R → S, experimental data for the measured initial rates is given below. The order of the… · ABC26PH0340

Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Chemical Kinetics – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Hard

For the reaction $\mathrm{P}+\mathrm{Q}+\mathrm{R} \rightarrow \mathrm{S}$, experimental data for the measured initial rates is given below.

Expt.	Initial conc. P (M)	Initial conc. Q (M)	Initial conc. R (M)	Initial rate $(\mathrm{Ms^{-1}})$
1	0.2	0.5	0.4	$8.0 \times 10^{-5}$
2	0.4	0.5	0.4	$3.2 \times 10^{-4}$
3	0.4	2.0	0.4	$1.28 \times 10^{-3}$
4	0.1	0.25	1.6	$4.0 \times 10^{-5}$

The order of the reaction with respect to P, Q and R respectively is:

(a)$2, 2, 1$

(b)$2, 1, 2$

(c)$2, 1, 1$

(d)$1, 1, 2$

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

Doubling [P] quadruples the rate (order 2); ×4 [Q] gives ×4 rate (order 1); experiment 4 then requires order 1 in R — 2, 1, 1 (c).

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