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. |
The rate law for the reaction involved in inversion of cane sugar is R=k [C12H22O11] [H2O]. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
What is the rate law for the reaction C2H4 + I2 → C2H4I2? |
| A. | R= [C2H4] [I2]3/2 |
| B. | R= [C2H4] [I2]3 |
| C. | R= [C2H4] [I2]2 |
| D. | R= [C2H4] [I2] |
| Answer» B. R= [C2H4] [I2]3 | |
| 3. |
How many times will the rate of the elementary reaction 3X + Y → X2Y change if the concentration of the substance X is doubled and that of Y is halved? |
| A. | r2= 4.5r1 |
| B. | r2= 5r1 |
| C. | r2= 2r1 |
| D. | r2= 4r1 |
| Answer» E. | |
| 4. |
What is the concentration of the reactant in a first order reaction when the rate of the reaction is 0.6 s-1 and the rate constant is 0.035? |
| A. | 26.667 M |
| B. | 17.143 M |
| C. | 26.183 M |
| D. | 17.667 M |
| Answer» C. 26.183 M | |
| 5. |
What is the rate law for acid hydrolysis of an ester such as CH3COOC2H5 in aqueous solution? |
| A. | k [CH3COOC2H5] |
| B. | k [CH3COOC2H5] [H2O] |
| C. | k [CH3COOC2H5]2 |
| D. | k |
| Answer» B. k [CH3COOC2H5] [H2O] | |
| 6. |
For the reaction A + H2O → products, find the rate of the reaction when [A] = 0.75 M, k= 0.02. |
| A. | 0.077 s-1 |
| B. | 0.085 s-1 |
| C. | 0.015 s-1 |
| D. | 0.026 s-1 |
| Answer» D. 0.026 s-1 | |
| 7. |
The reaction NO2 + CO → NO + CO2 takes place in two steps. Find the rate law.2NO2 → NO + NO3 (k1) – slowNO3 + CO → CO2 + NO2 (k2) – fast |
| A. | R = k1 [NO2]3 |
| B. | R = k2 [NO3] [CO] |
| C. | R = k1 [NO2] |
| D. | R = k1 [NO2]2 |
| Answer» E. | |
| 8. |
For a reaction A +B → C, the experimental rate law is found to be R=k[A]1[B]1/2. Find the rate of the reaction when [A] = 0.5 M, [B] = 0.1 M and k=0.03. |
| A. | 4.74 × 10-2 (L/mol)1/2 s-1 |
| B. | 5.38 × 10-2 (L/mol)1/2 s-1 |
| C. | 5.748 × 10-2 (L/mol)1/2 s-1 |
| D. | 4.86 × 10-2 (L/mol)1/2 s-1 |
| Answer» B. 5.38 × 10-2 (L/mol)1/2 s-1 | |
| 9. |
The rate constant of a reaction is k=3.28 × 10-4 s-1. Find the order of the reaction. |
| A. | Zero order |
| B. | First order |
| C. | Second order |
| D. | Third order |
| Answer» C. Second order | |
| 10. |
For a second-order reaction, what is the unit of the rate of the reaction? |
| A. | s-1 |
| B. | mol L-1s-1 |
| C. | mol-1 L s-1 |
| D. | mol-2 L2 s-1 |
| Answer» D. mol-2 L2 s-1 | |