In the presence of acid, the initial concentration of cane sugar was reduced from 0.2 M to 0.1 M in 5 h and to 0.05 M in 10 h. The reaction must be of

Options

A. Zero order
B. First order
C. Second order
D. Fractional order

Answer

B

Explanation

`0.2 M underset(t_(1//2) = 5 hr)rarr 0.1 M underset(t_(1//2) = 5 hr)rarr0.05 M`
form `0.2 M underset(t = 10 hr)rarr 0.05 M`
So `t_(1//2)` is constant which is characteristic of first order reaction.
Hence, `t_(1//2) prop (a)^(0)`.