Embibe Experts Solutions for Chapter: Chemical Kinetics, Exercise 3: EXERCISE-II (Previous Year Questions)

Which one of the following statements for the order of a reaction is incorrect?

The half life of a substance in a certain enzyme-catalysed reaction is $138 \mathrm{s}.$ The time required for the concentration of the substance to fall from $\mathrm{1.28 }\mathrm{mg} {\mathrm{L}}^{\mathrm{-1}} \text{to} 0.04 \mathrm{mg} {\mathrm{L}}^{\mathrm{-1}}$ is _____.

The decomposition of phosphine (${\mathrm{PH}}_3$) on tungsten at low pressure is a first-order reaction. It is because the _____.

For a reaction, $6{\mathrm{H}}^{+}+5{\mathrm{Br}}^{-}+{\mathrm{BrO}}_3^{-}\to 3{\mathrm{Br}}_2+6{\mathrm{H}}_2\mathrm{O}.$ If rate of consumption of ${\mathrm{BrO}}_3^{-}$ is $\mathrm{x} \mathrm{mol} {\mathrm{L}}^{-1} {\mathrm{s}}^{-1}$ Then calculate rate of formation of ${\mathrm{Br}}_2 :-$

On increasing temperature from $200 \mathrm{K}$ to $220 \mathrm{K}$ rate of reaction$\mathrm{A}$ increases by $3$ times and rate of reaction $\mathrm{B}$ increases by $9$ times then correct relationship between activation energy of $\mathrm{A}$ and $\mathrm{B}$ is

The correct difference between first and second order reaction is that

The rate of reaction between two reactants $\mathrm{A}$ and $\mathrm{B}$ decreases by a factor of $4$, if the concentration of reactant $\mathrm{B}$ is doubled. The order of this reaction with respect to reactant $\mathrm{B}$ is:

Higher order ($>3$) reactions are rare due to _______.