Which one of the following formula represents a first-order reaction?

Options

A. `K = (x)/(t)`
B. `K = (1)/(2t)[(1)/((a - x)^(2)) - (1)/(a^(2))]`
C. `K = (2.303)/(t)"log"_(10)(a)/((a - x))`
D. `K = (1)/(t) (x)/(a(a - x))`

Answer

C

Explanation

For Ist-order reaction
`K = (2.303)/(t)"log"_(10) (a)/((a-x))`