JEE Main 2022 · 27 Jul · Shift 2, Chemistry question 85

$$\underset{\text{Reactant}}{[A]}\rightarrow\underset{\text{Product}}{[B]}$$

If formation of compound [B] follows the first order of kinetics and after 70 minutes the concentration of [A] was found to be half of its initial concentration. Then the rate constant of the reaction is $x\times10^{-6}$ s$^{-1}$. The value of $x$ is ______. (Nearest Integer)