MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If a reaction is nth order the half-life period ________ of the initial concentration of the reactants. |
| A. | is independent |
| B. | varies inversely as (n-1)th power |
| C. | varies inversely as nth power |
| D. | varies directly as (n-1)th power |
| Answer» C. varies inversely as nth power | |
| 2. |
The rate of decomposition of a substance increases concentration of substance at same temperature. Find out order of reaction. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 3. |
The rate of reaction that does not involve gases, is not dependent on _____________ |
| A. | pressure |
| B. | temperature |
| C. | concentration |
| D. | catalyst |
| Answer» B. temperature | |
| 4. |
In a reaction, 2A2 + B2 → 2A2B, when the reactant A will disappear? |
| A. | half the rate that B will decrease |
| B. | the same rate that B will decrease |
| C. | double the rate that A2B will form |
| D. | twice the rate that B will decrease |
| Answer» E. | |
| 5. |
Rate = If the volume of reaction vessel is suddenly reduced to \(\frac{1}{4}\)th of initial value. How new rate will be affected? |
| A. | \(\frac{1}{10}\) |
| B. | \(\frac{1}{8}\) |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 6. |
For reaction system given below, volume is suddenly reduced to half of its value by increasing the pressure on it. If the reaction is of first order with respect to O2 and second order with respect to NO, what will be the change in the rate of reaction?2NO(g) + O2(g) + 2NO2(g) |
| A. | diminish to one-fourth of its initial value |
| B. | diminish to one-eight of its initial value |
| C. | increase to eight times of its initial value |
| D. | increase to four times of its initial value |
| Answer» D. increase to four times of its initial value | |
| 7. |
Sulfuric acid is used in |
| A. | pickling |
| B. | tanning leather |
| C. | all of them |
| D. | car batteries |
| Answer» D. car batteries | |
| 8. |
Which statement is incorrect? Along a column in Inert gases |
| A. | enthalpy change of vaporization increases |
| B. | number of electrons increases |
| C. | None of Above is incorrect. |
| D. | boiling points of noble gases decreases |
| Answer» E. | |
| 9. |
Hydrogen peroxide reacts with iodide ions to form water and iodine in presence of |
| A. | hydrogen ions |
| B. | iodine ions |
| C. | all of them |
| D. | oxide ions |
| Answer» B. iodine ions | |
| 10. |
SO2 is |
| A. | insoluble in water |
| B. | soluble in water |
| C. | None of Above |
| D. | sparingly soluble in water |
| Answer» C. None of Above | |
| 11. |
Which compound is electron deficient? |
| A. | AlBF3 |
| B. | Al2Cl6 |
| C. | BF3 |
| D. | SF6 |
| Answer» D. SF6 | |
| 12. |
IF_A_REACTION_IS_NTH_ORDER_THE_HALF-LIFE_PERIOD__________OF_THE_INITIAL_CONCENTRATION_OF_THE_REACTANTS.?$ |
| A. | is independent |
| B. | varies inversely as (n-1)<sup>th</sup> power |
| C. | varies inversely as n<sup>th</sup> power |
| D. | varies directly as (n-1)<sup>th</sup> power |
| Answer» C. varies inversely as n<sup>th</sup> power | |
| 13. |
The rate of decomposition of a substance increases concentration of substance at same temperature. Find out order of reaction? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 14. |
Which is not true for a second order reduction? |
| A. | It can have rate constant 1 x 10<sup>-2</sup> L mol<sup>-1</sup> s<sup>-1</sup> |
| B. | Its half-life is inversely proportional to its initial concentration |
| C. | Time to complete 75% reaction is twice of half-life |
| D. | T<sub>50</sub> = 1/(k<sub>a</sub>‚ãÖA<sub>0</sub>) |
| Answer» D. T<sub>50</sub> = 1/(k<sub>a</sub>‚Äö√Ñ√∂‚àö¬£‚àö√±A<sub>0</sub>) | |
| 15. |
The rate of reaction that does not involve gases, is not dependent on: |
| A. | pressure |
| B. | temperature |
| C. | concentration |
| D. | catalyst |
| Answer» B. temperature | |
| 16. |
In a reaction, 2A2 + B2 ‚Üí 2A2B, when the reactant A will disappear?$ |
| A. | half the rate that B will decrease |
| B. | the same rate that B will decrease |
| C. | double the rate that A2B will form |
| D. | twice the rate that B will decrease |
| Answer» E. | |
| 17. |
The rate of reaction, A + B Products, is given by the equation, r = k[A][B]. If B is taken in excess, what would be the order of reaction? |
| A. | 2 |
| B. | 1 |
| C. | zero |
| D. | unpredictable |
| Answer» C. zero | |
| 18. |
On which factor the rate constant of a reaction does not depend upon? |
| A. | temperature |
| B. | activation energy |
| C. | catalyst |
| D. | concentration of reactants and products |
| Answer» E. | |
| 19. |
Rate = If the volume of reaction vessel is suddenly reduced to 1/4th of initial value. How new rate will be affected? |
| A. | <sup>1</sup>‚ÅÑ<sub>10</sub> |
| B. | <sup>1</sup>‚ÅÑ<sub>8</sub> |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 20. |
The rate law for a reaction between the substances A and B is given by rate = K[A]n [B]m. On doubling the concentration of A and halving the concentration of B. What will be the ratio of the new rate of the earlier rate of the reaction? |
| A. | (1‚ÅÑ2)<sup>m+n</sup> |
| B. | m+n |
| C. | n-m |
| D. | 2<sup>n-m</sup> |
| Answer» E. | |
| 21. |
For reaction system given below, volume is suddenly reduced to half of its value by increasing the pressure on it. If the reaction is of first order with respect to O2 and second order with respect to NO, what will be the change in the rate of reaction? |
| A. | + O<sub>2</sub>(g) + 2NO<sub>2</sub>(g) |
| B. | diminish to one-fourth of its initial value |
| C. | diminish to one-eight of its initial value |
| D. | increase to eight times of its initial value |
| Answer» D. increase to eight times of its initial value | |