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.
