For a certain decompoistion, the rate is `0.30 M s^(-1)` when the concentration of the reactant is `0.20 M`. If the reaction is order, the rate (in `M s^(-1)`) when concentration is increased theee times is

Options

A. `0.30`
B. `0.90`
C. `0.60`
D. `2.70`

Answer

D

Explanation

`r_(1) = k[A]^(2)`
`0.30 M s^(-1) = k(0.2)^(2)`
`r_(2) = k(0.2 xx 3)^(2)`
form Eqs. (i) and (ii),
`r_(2) = r_(1) xx 9 = 0.3 xx 9 = 2.7 M s^(-1)`