Conisder a reaction `aG+bH rarr` Products. When concentration of both the reactants `G` and `H` is doubled, the rate increases eight times. However, when the concentration of `G` is doubled, keeping the concentration of `H` fixed, the rate is doubled. The overall order of reaction is

Options

A. `0`
B. `1`
C. `2`
D. `3`

Answer

D

Explanation

Doubling the concentration of both `G` and `H` increases the rate of the reaction by eight times. Doubling the concentration of only `G` also doubles the rate of the reaction, so the order with respect to `G` is one. It means that the rate of the reaction is also dependent on the second power of the concentration of `H`. So the rate law is `r = k[G][H]^(2)` and the order is `3`.