MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For the reaction C2H5COOC2H5 + H2O C2H5COOH + C2H5OH, find the concentration of [C2H5COOC2H5] if the rate constant k=0.2 and the rate of the reaction is 0.39 s-1. |
| A. | 2.87 M |
| B. | 2.01 M |
| C. | 1.99 M |
| D. | 1.95 M |
| Answer» E. | |
| 2. |
Which of the following is not an example of a pseudo first-order reaction? |
| A. | CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub> + NaOH CH<sub>3</sub>COOH + H<sub>2</sub>O |
| B. | CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub> + H<sub>2</sub>O CH<sub>3</sub>COOH + C<sub>2</sub>H<sub>5</sub>OH |
| C. | C<sub>2</sub>H<sub>5</sub>COOC<sub>2</sub>H<sub>5</sub> + H<sub>2</sub>O C<sub>2</sub>H<sub>5</sub>COOH + C<sub>2</sub>H<sub>5</sub>OH |
| D. | C<sub>12</sub>H<sub>22</sub>O<sub>11</sub> + H<sub>2</sub>O glucose + fructose |
| Answer» B. CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub> + H<sub>2</sub>O CH<sub>3</sub>COOH + C<sub>2</sub>H<sub>5</sub>OH | |
| 3. |
Which of the following is not similar between a first order and pseudo first order reaction? |
| A. | The molecularity is one in both the reactions |
| B. | Both follows first order kinetics |
| C. | The unit of rate constant is s<sup>-1</sup> |
| D. | The rate of the reaction depends only on one reactant |
| Answer» B. Both follows first order kinetics | |
| 4. |
Which of the following is not true for a pseudo first-order reaction? |
| A. | The reaction follows first order kinetics |
| B. | Molecularity of the reaction should be one |
| C. | The reactants such as water are present in excess and are assumed to be constant throughout the reaction |
| D. | Unit of the rate constant is s<sup>-1</sup> |
| Answer» C. The reactants such as water are present in excess and are assumed to be constant throughout the reaction | |
| 5. |
What is the rate law of hydrolysis of CH3COOC2H5 in aqueous solution? |
| A. | R=k [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>]<sup>2</sup> |
| B. | R=k [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>] |
| C. | R=k [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>] [H<sub>2</sub>O] |
| D. | R=kk [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>][H<sub>2</sub>O] |
| Answer» C. R=k [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>] [H<sub>2</sub>O] | |
| 6. |
The rate law for inversion of cane sugar is R=k [C12H22O11][H2O]. Find the concentration of sucrose if the rate of the reaction is 0.032 s-1 and rate constant k=0.005. |
| A. | 5.8 M |
| B. | 6 M |
| C. | 6.2 M |
| D. | 6.4 M |
| Answer» E. | |
| 7. |
Acid hydrolysis of esters such as CH3COOC2H5 in aqueous solution is an example of a pseudo first-order reaction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Which of the following reactions is an example of a pseudo first-order reaction? |
| A. | H<sub>2</sub> + Br<sub>2</sub> 2HBr |
| B. | CH<sub>3</sub>CHO CH<sub>4</sub> + CO |
| C. | C<sub>12</sub>H<sub>22</sub>O<sub>11</sub> + H<sub>2</sub>O glucose + fructose |
| D. | PCl<sub>5</sub> PCl<sub>3</sub> + Cl<sub>2</sub> |
| Answer» D. PCl<sub>5</sub> PCl<sub>3</sub> + Cl<sub>2</sub> | |
| 9. |
Reactions whose molecularity is one but order is more than one are known as pseudo first-order reactions. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
For a pseudo first-order reaction, what is the unit of the rate of the reaction? |
| A. | s<sup>-1</sup> |
| B. | mol L<sup>-1</sup>s<sup>-1</sup> |
| C. | mol<sup>-1</sup> L s<sup>-1</sup> |
| D. | mol<sup>-2</sup> L<sup>2</sup> s<sup>-1</sup> |
| Answer» B. mol L<sup>-1</sup>s<sup>-1</sup> | |