Published by:
CGP EDU Academic Team
Published on: August 14, 2026
For reaction a 
, when 
, the rate was found to be 
. On reducing concentration of A to half, the rate changes to 
. The order of reaction with respect to A is
Text Solution
Verified by ExpertsThe correct answer is:
B
aA → → xP
Rate of reaction = [ A ] a
Order of reaction = a
[ A ] 1 = 2.2 mM , r 1 = 2.4 m M s –1 ...(i)
[ A ] 2 = 2.2/2 mM , r 1 = 0.6 m M s –1 or, 
...(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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