State whether the following statements are true $(T)$ or false $(F)$.
$(a)$ In a pseudo first order reaction,the rate and rate constant are determined with respect to the reactant present in lower concentration.
$(b)$ The hydrolysis of an ester is carried out in the presence of an excess of water in an acidic medium.
$(c)$ The hydrolysis of an ester is a second order reaction.

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(F, F, F) False. In a pseudo first order reaction,the reactant present in large excess does not affect the rate of reaction,so the rate depends only on the concentration of the reactant present in lower concentration.
$(b)$ False. The hydrolysis of an ester is carried out in the presence of an excess of water (solvent),not an excess of ester.
$(c)$ False. Although the rate law for the hydrolysis of an ester is $Rate = k[Ester][H_2O]$,because water is in large excess,its concentration remains effectively constant. Thus,the reaction follows pseudo first order kinetics,not second order.

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For the reaction $H_{2(g)} + Br_{2(g)} \rightarrow 2HBr_{(g)}$,the experimental data suggests the rate law is $\text{Rate} = K[H_2][Br_2]^{1/2}$. Find the order of the reaction and its molecularity.

Which one of the following is wrong about molecularity of a reaction?

For the reaction $A_2 + B_2 \to 2AB$,the experimental data is given below. Determine the order of the reaction.
Experiment No. $[A_2] \text{ (M)}$ $[B_2] \text{ (M)}$ Rate $(M \cdot s^{-1})$
$1$ $0.1$ $0.1$ $1.6 \times 10^{-4}$
$2$ $0.1$ $0.2$ $3.2 \times 10^{-4}$
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$2B \xrightarrow{k} B_2$ $[Slow]$
$B_2 + A \to D$ $[Fast]$
The rate law expression,order with respect to $A$,order with respect to $B$ and overall order of reaction are respectively

........ of a reaction cannot be determined experimentally.

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