Calculate the rate constant of first order reaction $\text{A} \rightarrow \text{B}$ having rate $5.4 \times 10^{-6}\ \text{mol dm}^{-3}\text{s}^{-1}$ and $[\text{A}] = 0.3$ M.

What is the order and molecularity of the following elementary reaction?
$2\text{NO}_{2(g)} \rightarrow 2\text{NO}_{(g)} + \text{O}_{2(g)}$, rate $= k \times [\text{NO}_2]^2$

Identify correct statement regarding order of reaction from following.

Calculate rate constant of a first order reaction having half life $1$ minute $40$ second?