Which of the following graphs represent a first order reaction (a=initial concentration of reactant, x=concentration of reactant consumed, t=time)

Options

A. i,iii, iv
B. i,iii
C. ii,iii,iv
D. i,iv

Answer

B

Explanation

For, zero order reaction
`t_(1//2) = (a)/(2K)` and for zero order reaction. Concentration is independent from state. So, `(dx)/(dt)` is constant.