Question

For a reaction 3A → products, it is found that the rate of reaction doubles, if concentration of A is increased four times, calculate order of reaction -

(A) 1 

(B) 1/2 

(C) 2 

(D) 3

Answer 1

Correct Option (B) 1/2 

Explanation:

Rate = k [Reactant]ⁿ

if [Reactant] = a ; rate = r₁

if [Reactant] = 4a ; rate = 2r₁

r₁ = k [4a]ⁿ

2r₁ = k [4a]ⁿ 

1/2 = [1/4]ⁿ

^{n = 1/2}