Molecularity and Mechanism of a Reaction
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CHXII04:CHEMICAL KINETICS

320565 A following mechanism has been proposed for a reaction.

\(2 \mathrm{P}+\mathrm{Q} \rightarrow \mathrm{R}+\mathrm{S}\)

Mechanism:

\(\mathrm{P}+\mathrm{Q} \rightarrow \mathrm{T}+\mathrm{R}\) (slow)

\(\mathrm{P}+\mathrm{Q} \rightarrow \mathrm{R}\) (fast)

The rate law expression for the reaction is

1 \(\mathrm{r}=\mathrm{k}[\mathrm{P}][\mathrm{Q}]\)
2 \(\mathrm{r}=\mathrm{k}[\mathrm{P}]^{2}\)
3 \(\mathrm{r}=\mathrm{k}[\mathrm{P}][\mathrm{T}]\)
4 \(\mathrm{r}=\mathrm{k}[\mathrm{P}]^{2}[\mathrm{Q}]\).
CHXII04:CHEMICAL KINETICS

320566 Which of the following statements regarding the molecularity of reaction is wrong?

1 It is the number of molecules of the reactions taking part in a single step chemical reaction.
2 It is calculated from the reaction mechanism.
3 It may be either a whole number or dfractional.
4 It depends on the rate determining step in the reaction.
CHXII04:CHEMICAL KINETICS

320567 The reaction \({\text{2}}\;{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{5}}} \rightleftharpoons {\text{2}}\;{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{4}}}{\text{ + }}{{\text{O}}_{\text{2}}}\)is

1 Bimolecular and second order
2 Unimolecular and first order
3 Bimolecular and first order
4 Bimolecular and zero order
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CHXII04:CHEMICAL KINETICS

320565 A following mechanism has been proposed for a reaction.

\(2 \mathrm{P}+\mathrm{Q} \rightarrow \mathrm{R}+\mathrm{S}\)

Mechanism:

\(\mathrm{P}+\mathrm{Q} \rightarrow \mathrm{T}+\mathrm{R}\) (slow)

\(\mathrm{P}+\mathrm{Q} \rightarrow \mathrm{R}\) (fast)

The rate law expression for the reaction is

1 \(\mathrm{r}=\mathrm{k}[\mathrm{P}][\mathrm{Q}]\)
2 \(\mathrm{r}=\mathrm{k}[\mathrm{P}]^{2}\)
3 \(\mathrm{r}=\mathrm{k}[\mathrm{P}][\mathrm{T}]\)
4 \(\mathrm{r}=\mathrm{k}[\mathrm{P}]^{2}[\mathrm{Q}]\).
CHXII04:CHEMICAL KINETICS

320566 Which of the following statements regarding the molecularity of reaction is wrong?

1 It is the number of molecules of the reactions taking part in a single step chemical reaction.
2 It is calculated from the reaction mechanism.
3 It may be either a whole number or dfractional.
4 It depends on the rate determining step in the reaction.
CHXII04:CHEMICAL KINETICS

320567 The reaction \({\text{2}}\;{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{5}}} \rightleftharpoons {\text{2}}\;{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{4}}}{\text{ + }}{{\text{O}}_{\text{2}}}\)is

1 Bimolecular and second order
2 Unimolecular and first order
3 Bimolecular and first order
4 Bimolecular and zero order
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CHXII04:CHEMICAL KINETICS

320565 A following mechanism has been proposed for a reaction.

\(2 \mathrm{P}+\mathrm{Q} \rightarrow \mathrm{R}+\mathrm{S}\)

Mechanism:

\(\mathrm{P}+\mathrm{Q} \rightarrow \mathrm{T}+\mathrm{R}\) (slow)

\(\mathrm{P}+\mathrm{Q} \rightarrow \mathrm{R}\) (fast)

The rate law expression for the reaction is

1 \(\mathrm{r}=\mathrm{k}[\mathrm{P}][\mathrm{Q}]\)
2 \(\mathrm{r}=\mathrm{k}[\mathrm{P}]^{2}\)
3 \(\mathrm{r}=\mathrm{k}[\mathrm{P}][\mathrm{T}]\)
4 \(\mathrm{r}=\mathrm{k}[\mathrm{P}]^{2}[\mathrm{Q}]\).
CHXII04:CHEMICAL KINETICS

320566 Which of the following statements regarding the molecularity of reaction is wrong?

1 It is the number of molecules of the reactions taking part in a single step chemical reaction.
2 It is calculated from the reaction mechanism.
3 It may be either a whole number or dfractional.
4 It depends on the rate determining step in the reaction.
CHXII04:CHEMICAL KINETICS

320567 The reaction \({\text{2}}\;{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{5}}} \rightleftharpoons {\text{2}}\;{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{4}}}{\text{ + }}{{\text{O}}_{\text{2}}}\)is

1 Bimolecular and second order
2 Unimolecular and first order
3 Bimolecular and first order
4 Bimolecular and zero order
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