The rate of reaction `A + 2B rarr 3C` gets increased by 72 times when the concentration of A is tripled and that of B is doubled. The order of the reaction with present to A and B are….. And ….. Respectively.

Options

A. 1,2
B. 2,3
C. 3,2
D. 2,2

Answer

B

Explanation

`R=k[A]^(a)[B]^(b)`
`72R=k[3A]^(a)[2B]^(b)`
`72=3^(a).2^(b)`
Hence `a=2, b=3`