For an elementary reaction, $2A + B \to   C + D$ the molecularity is

Write differential rate expression of following reaction and give its order of reaction :

$2 HI \rightarrow H _{2}+ I _{2}$

$2 NO _{( g )}+ O _{2( g )} \rightarrow 2 NO _{2( g )}$

The following mechanism has been proposed for the reaction of $NO$ with $Br_2$ to form $NOBr$ :

$NO(g) + Br_2 (g) \rightleftharpoons NOBr_2 (g)$

$NOBr_2(g)+ NO(g) \longrightarrow 2NOBr(g)$

If the second step is the rate determining step, the order of the reaction with respect to $NO(g)$ is

If order of a reaction is $x$ then unit of it's rate constant is

The rate of dissappearance of $MnO_4^-$ in the following reaction is $4.56 \times 10^{-3}\, M/s$

$2MnO_4^-+ 10I^-+ 16H^+ \to 2Mn^{2+} + 5I_2 + 8 H_2O$

The rate of apperance of $I_2$ is

The reaction $2{N_2}{O_5}$ $\rightleftharpoons$ $2N{O_2} + {O_2}$ follows first order kinetics. Hence, the molecularity of the reaction is