MCQOPTIONS
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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Solutions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
At equilibrium the rate of dissociation of a solid solute in a volatile liquid solvent is |
| A. | less than the rate of crystallisation |
| B. | greater than the rate of crystallisation |
| C. | equal to the rate of crystallisation |
| D. | zero |
| Answer» D. zero | |
| 2. |
The standard electrode potentials for the half cell reactions are: Zn Zn2- 2e E = 0.76 V Fe Fe2- + 2 E = -0.41 V The emf of the cell reaction Fe2- + Zn Zn2- + Fe is |
| A. | -0.35 V |
| B. | +0.35 V |
| C. | -1.17 V |
| D. | +1.17 V |
| Answer» C. -1.17 V | |
| 3. |
Which of the following units is useful in relating concentration of solution with its vapour pressure? |
| A. | Mole fraction |
| B. | Parts per million |
| C. | Mass percentage |
| D. | Molality |
| Answer» B. Parts per million | |
| 4. |
Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved in the process is |
| A. | lowering in vapour pressure of snow |
| B. | depression in freezing point of snow |
| C. | melting of ice due to increase in temperature by putting salt |
| D. | increase in freezing point of snow |
| Answer» C. melting of ice due to increase in temperature by putting salt | |
| 5. |
What will be the degree of dissociation of 0.1 M Mg(NO3)2 solution if van t Hoff factor is 2.74? |
| A. | 75% |
| B. | 87% |
| C. | 100% |
| D. | 92% |
| Answer» C. 100% | |
| 6. |
For carrying reverse osmosis for desalination of water the material used for making semipermeable membrane is |
| A. | potassium nitrate |
| B. | parchment membrane |
| C. | cellulose acetate |
| D. | cell membrane |
| Answer» D. cell membrane | |
| 7. |
The osmotic pressure of a solution can be increased by |
| A. | increasing the volume |
| B. | increasing the number of solute molecules |
| C. | decreasing the temperature |
| D. | removing semipermeable membrane |
| Answer» C. decreasing the temperature | |
| 8. |
A 5% solution of cane-sugar (molecular weight = 342) is isotonic with 1% solution of substance A. The molecular weight of X is |
| A. | 342 |
| B. | 171.2 |
| C. | 68.4 |
| D. | 136.8 |
| Answer» D. 136.8 | |
| 9. |
What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10 C ? |
| A. | 496 g |
| B. | 297 g |
| C. | 310 g |
| D. | 426 g |
| Answer» C. 310 g | |
| 10. |
The atmospheric pollution is generally measured in the units of |
| A. | mass percentage |
| B. | volume percentage |
| C. | volume fraction |
| D. | ppm |
| Answer» E. | |
| 11. |
A plant cell shrinks when it is kept in a |
| A. | hypotonic solution |
| B. | hypertonic solution |
| C. | isotonic solution |
| D. | pure water |
| Answer» C. isotonic solution | |
| 12. |
The system that forms maximum boilingazetrope is |
| A. | Acetone-chloroform |
| B. | ethanol-acetone |
| C. | n-hexane-n-heptane |
| D. | carbon disulphide-acetone |
| Answer» B. ethanol-acetone | |
| 13. |
If 2 gm of NaOH is present is 200 ml of its solution, its molarity will be |
| A. | 0.25 |
| B. | 0.5 |
| C. | 5 |
| D. | 10 |
| Answer» B. 0.5 | |
| 14. |
Which of the following solutions shows positive deviation from Raoult s law? |
| A. | Acetone + Aniline |
| B. | Acetone + Ethanol |
| C. | Water + Nitric acid |
| D. | Chloroform + Benzene |
| Answer» C. Water + Nitric acid | |
| 15. |
Atomic mass is equal to |
| A. | number of electrons of an atom |
| B. | sum of the numbers of electrons and protons of an atom |
| C. | sum of the numbers of neutrons and protons of an atom |
| D. | none of these |
| Answer» C. sum of the numbers of neutrons and protons of an atom | |
| 16. |
The law which indicates the relation -hip between solubility of a gas in liquid and pressure rs |
| A. | Raoult s law |
| B. | Henry s law |
| C. | Lowering of vapour pressure |
| D. | Van t Hoff law |
| Answer» C. Lowering of vapour pressure | |
| 17. |
3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively? |
| A. | 80 torr |
| B. | 140 torr |
| C. | 72 torr |
| D. | 70 torr |
| Answer» D. 70 torr | |
| 18. |
234.2 gm of sugar syrup contains 34.2 gm of sugar. What is the molal concentration of the solution. |
| A. | 0.1 |
| B. | 0.5 |
| C. | 5.5 |
| D. | 55 |
| Answer» C. 5.5 | |
| 19. |
Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 gof Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y? |
| A. | 20 |
| B. | 50 |
| C. | 100 |
| D. | 200 |
| Answer» C. 100 | |
| 20. |
Among the following substances the lowest vapour pressure is exerted by |
| A. | water |
| B. | alcohol |
| C. | ether |
| D. | mercury |
| Answer» E. | |
| 21. |
Partial pressure of a solution component is directly proportional to its mole fraction. This is known as |
| A. | Henry s law |
| B. | Raoult s law |
| C. | Distribution law |
| D. | Ostawald s dilution law |
| Answer» C. Distribution law | |
| 22. |
A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine? |
| A. | 91.8 g |
| B. | 1198 g |
| C. | 83.9 g |
| D. | 890.3 g |
| Answer» B. 1198 g | |
| 23. |
The relative lowering in vapour pressure is proportional to the ratio of number of |
| A. | solute molecules to solvent molecules |
| B. | solvent molecules to solute molecules |
| C. | solute molecules to the total number of molecules in solution |
| D. | solvent molecules to the total number of molecules in solution |
| Answer» D. solvent molecules to the total number of molecules in solution | |