Chemistry · JEE

Important Questions: Elementary and complex reactions, order and molecularity of reactions, rate law, rate constant and its units for JEE

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The most important Elementary and complex reactions, order and molecularity of reactions, rate law, rate constant and its units questions for JEE cover conceptual traps, standard results, and numerical patterns from Elementary and complex reactions, order and molecularity of reactions, rate law, rate constant and its units. Goodmarks provides 7+ high-yield MCQs with full solutions.

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Part of Chemical Kinetics in JEE Main Chemistry.

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Q1ChemistryUnit 8: Chemical Kinetics

A reaction

A+B \rightarrow C

is second order with respect to

A

and independent of

B

The rate expression for the reaction is:

Q2ChemistryUnit 8: Chemical Kinetics

Statement - I : The molecularity of the reaction

\boldsymbol{H}_{2}+\boldsymbol{B} \boldsymbol{r}_{2} \rightarrow 2 \mathrm{HBr}

is 2 Statement - II: The order of this reaction is

3 / 2

Q3ChemistryUnit 8: Chemical Kinetics

The choices below are some of the proposed steps of a reaction mechanism. Which step is least likely to be the ratedetermining step of the mechanism?

Q4ChemistryUnit 8: Chemical Kinetics

Which one of the following statements for order of reaction is not correct?

Q5ChemistryUnit 8: Chemical Kinetics

In the hydrolysis of organic chloride in the presence of a large excess of water,

\boldsymbol{R C l}+\boldsymbol{H}_{2} \boldsymbol{O} \rightarrow \boldsymbol{R O H}+\boldsymbol{H} \boldsymbol{C l}

Q6ChemistryUnit 8: Chemical Kinetics

For the reaction given below,

\mathbf{2} \mathbf{O}_{\mathbf{3}}(\mathbf{g}) \rightarrow \mathbf{3} \mathbf{O}_{\mathbf{2}}(\mathbf{g})

\operatorname{Step} \mid: \mathbf{O}_{3}(\mathbf{g}) \rightarrow \mathbf{O}_{2}(\mathbf{g})+\mathbf{O}(\mathbf{g})

Step

2: \mathrm{O}_{3}(\mathrm{g})+\mathrm{O} \rightarrow^{\text {slow }} 2 \mathrm{O}_{2}(\mathrm{g})

Statement I: The molecularity of the first step is 1 and of the second step is 2 Statement-II:

O(g)

is an intermediate and rate of reaction is

\mathbf{K}\left[\mathbf{O}_{3}\right]^{2}\left[\mathbf{O}_{2}\right]^{-1}

and order of reaction is 1

Q7ChemistryUnit 8: Chemical Kinetics

Which of the following statement is true for the reaction,

\boldsymbol{H}_{2}+\boldsymbol{B} \boldsymbol{r}_{2} \rightarrow \boldsymbol{2} \boldsymbol{H} \boldsymbol{B} \boldsymbol{r}

The rate law is

\frac{\boldsymbol{d} \boldsymbol{x}}{\boldsymbol{d} \boldsymbol{t}}=\boldsymbol{k}\left[\boldsymbol{H}_{2}\right]\left[\boldsymbol{B} \boldsymbol{r}_{2}\right]^{1 / 2}

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