The rate constant of which of the following reactions is independent of concentration of the reactants ?

The rate of the reaction becomes twice when the concentration of reactant becomes $8$ times then the order of the reaction is

units of rate constant of first and zero order reactions in terms of molarity $M$ unit are respectively

For the elementary reaction $M \rightarrow N$, the rate of disappearance of $M$ increases by a factor of $8$ upon doubling the concentration of $M$. The order of the reaction with respect to $M$ is :

 Which of the following optioms correctly represents relationship between $t_{7/8}$ and $t_{1/2}$ where $t_{7/8}$ represent time required for concentration to become $\frac{1}{8} \,th$ of original for  a reaction of order $'n'$

The mechanism of the reaction $A + 2B \to D$ is

$2B\xrightarrow{k}{B_2}$        [Slow]

${B_2} + A \to D$          [Fast]

The rate law expression, order with respect to $A$, order with respect to $'B'$ and overall order are respectively