For a reaction `2A +B rarr C+D`, the active mass of B is kept constant but tht of A is tripled. The rate of reaction will

Options

A. increases six times
B. increases nine times
C. decreases three times
D. decreases nine times

Explanation

Thoretical rate of reaction, `2A + B to C+ D` is
`(dx)/(dt)=r_1[A]^2xx[B]` …(i)
`r_2 = k[3A]^2xx[B]`
Dividing (ii) by (i)
`r_2/r_1=(k[3A]^2[B])/(k[A]^2[B]) = 9 or r_2= 9r_1`