Question

For a certain reaction, the rate = k[NO]^2[O2], when the initial concentration of NO is tripled, the initial rate ___________

(a) Increases by a factor of nine

(b) Increases by a factor of three

(c) Increases by a factor of six

(d) Decreases by a factor of nine

I had been asked this question by my school teacher while I was bunking the class.

This intriguing question originated from Pseudo Order Reaction in portion Reaction Dynamics of Engineering Chemistry I

Answer 1

Right option is (a) Increases by a factor of nine

For explanation I would say: For a certain reaction, the rate = k[NO]^2[O2], when the initial concentration of NO is tripled, the initial rate increases by a factor of nine. Here, the reaction is of the order 3.