Chemical Kinetics Question 213

Question: For reaction a $ A\to x\ P $ , when $ [A]=2.2\ mM $ , the rate was found to be $ 2.4\ mM\ {s^{-1}} $ . On reducing concentration of A to half, the rate changes to $ 0.6\ mM\ {s^{-1}} $ . The order of reaction with respect to A is [AIIMS 2005]

Options:

A) 1.5

B) 2.0

C) 2.5

D) 3.0

Show Answer

Answer:

Correct Answer: B

Solution:

aA ® xP

Rate of reaction = [A]a

Order of reaction = a [A]1 = 2.2 mM, r1 = 2.4 m M s-1 …(i) [A]2 = 2.2/2 mM, r1 = 0.6 m M s-1 or, $ \frac{2.4}{4} $ …(ii)

On reducing the concentration of A to half, the rate of reaction is decreased by four times. Rate of reaction = [A]2 Order of reaction = 2.



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