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Chemical Kinetics

Question
CBSEENCH12006314

For the reaction Cl2(g) + 2NO(g) → 2NOCl(g) the rate law is expressed as rate = k[Cl2] [NO]2.
What is the overall order of reaction?

Solution
The overall order of the reaction for given 
rate = k[Cl2] [NO]2


order of Cl= 1
order of [NO]2 =2

order =1+2 =3