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June 2022

Home2022JunePage 19

9. A drop of oil is placed on the surface of water. Which of the following statement is correct

(a)  It will remain on it as a sphere (b)  It will spread as a thin layer (c)   It will...

21. Least soluble gas in water will is

a. He b. O2 c. NH3 d. CO2 Ans. a Explanation : As the value of Henry’s law constant increases,...

8. If temperature increases, the surface tension of a liquid

(a)  Increases (b)  Decreases (c)   Remains the same (d)  Increases then decreases Ans. b (13)

5. Soap helps in cleaning clothes, because

(a)  Chemicals of soap change (b)  It increases the surface tension of the solution (c)   It absorbs the dirt (d) ...

18. Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon….

a. Temperature b. Nature of solute c. Pressure d. Nature of solvent Ans. c Explanation : Maximum amount of solid...

4. When there is no external force, the shape of a liquid drop is determined by

(a)  Surface tension of the liquid (b)  Density of liquid (c)   Viscosity of liquid (d)  Temperature of air only Ans....

17. A beaker contains s solution of substance ‘A’ precipitation of substance ‘A’ takes place when small amount of ‘A’ is added to the solution . The solution is…

a. Saturated b. Supersaturated c. Unsaturated d. Concentrated Ans. b Explanation : when solute is added to the solution three...

4. When there is no external force, the shape of a liquid drop is determined by

(a)  Surface tension of the liquid (b)  Density of liquid (c)   Viscosity of liquid (d)  Temperature of air only Ans....

16. At equilibrium the rate of dissolution 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...

15. Normal human blood sugar range is 65 – 105 mg/dL. Considering density of human blood is 1.06kg/L, if a patient’s sugar level reads 720 ppm, his/her blood sugar at that time is

a. Normal b. High c. Low d. Cannot say Ans. a (24)

3. Surface tension is due to

(a)  Frictional forces between molecules (b)  Cohesive forces between molecules (c)   Adhesive forces between molecules (d)  Gravitational forces Ans. b...

14. When a gas is bubbled through water at 298 K, a very dilute solution of the gas is obtained. Henry’s law constant for the gas at 298 K is 100 kbar. If the gas exerts a partial pressure of 1 bar the number of millimoles of the gas dissolved in one litre of water is

a. 0. 555 b. 5.55 c. 0.0555 d. 55.5 e. 5. 55 x 10-4  Ans. a (12)

13. Which among the following gas will greatly deviate from Henry’s law in water

a. H2 b. N2 c. CH4 d. CO2 e. Ar Ans. d Explanation : CO2    reacts with water and therefore...

6. When a crystal of the solute is introduced into a super saturated solution of the solute

a. The solute dissolve b. The excess solutes crystallizes out c. The solution becomes unsaturated d. The solution remains super...

9. What type of crystal defect is indicated in the diagram below

  a. Interstitial defect b. Schottky defect c. Frenkel defect d. Frenkel and schottky defect Ans. b (19)

2. The spherical shape of rain-drop is due to

(a)   Density of the liquid (b)  Surface tension (c)   Atmospheric pressure (d)  Gravity Ans. b (13)

12. The Henry’s law constant for the solubility of

N2  gas in water at 298 K is 1.0 x 10 5  atm. The mole fraction of N2   in air is 0.8....

1. The value of surface tension of a liquid at critical temperature is

(a)      Zero (b)  Infinite (c)   Between 0 and ∞ (d)  Can not be determined Ans. a (14)

10. The value of Henry’s constant,

K H   is …….. a. Greater for gases with higher solubility b. Greater for gases with lower solubility c. Constant for...

9. Value of Henry’s constant

KH  ………… a. Increases with increase in temperature b. Decrease with increase in temperature c. Remains constant d. First increase then...

8. On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid

a. Sugar crystals in cold water b. Sugar crystals in hot water c. Powered sugar in cold water d. Powered...

7. 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 Ans.a (7)

5. Henry’s law constants for aqueous solution of CO,

O2  and C2 H2  gases  are respectively  at 25°  C as 58 x 103 , 43 x 103  , 1.61...

16.The length of a rod is 20 cm and area of cross-section

16.The length of a rod is 20 cm and area of cross-section 2 cm2 . The Young’s modulus of the...

4. Out of following which one is not an example of a solution

a. Air b. Brass c. Amalgam d. Benzene in water Ans. d Explanation : Benzene can’t be dissolved in water...

3. Which is correct about Henry’s law

a. The gas in contact with the liquid should behave as an ideal gas b. There should not be any...

15. The ratio of Young’s modulus of the material of two wires is 2 : 3. If the same stress is applied on both, then the ratio of elastic energy per unit volume will be

(a)   3 : 2                                 ...

14. The Young’s modulus of a wire is Y. If the energy per unit volume is E, then the strain will be

(a)  √(2E)/Y                                     ...

2. The statement “The mass of a gas dissolved in a given mass of a solvent at any temperature is proportional to the pressure of the gas above the solvent” is

a. Dalton’s Law of Partial pressures b. Law of Mass Action c. Henry’s Law d. None of these Ans. c...

1. The Solubility of a gas in water depends on

a. Nature of the gas b. Temperature c. Pressure of the gas d. All of the above Ans. d (10)

13. In the above question, the ratio of the increase in energy of the wire to the decrease in gravitational potential energy when load moves downwards by 1 mm, will be

(a)   1                                     ...

12. A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1.0 mm, the increase in energy of the wire will be

(a)   0.01 J                                               (b)   0.02 J (c)   0.04 J                       ...

11. If one end of a wire is fixed with a rigid support and the other end is stretched by a force of 10 N, then the increase in length is 0.5 mm. The ratio of the energy of the wire and the work done in displacing it through 1.5 mm by the weight is

(a)  1/3                                     ...

6. Assertion : Anion vacancies in alkali halides are produced by heating the alkali halide crystals with alkali metal vapour. Reason : Electrons trapped in anion vacancies are referred to as F- centres.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If...

5. Assertion : The presence of a large number of Schottky defects in NaCl lowers its density. Reason : In NaCl there are approximately

106 Schottky pairs per cm3 at room temperature. a. If both assertion and reason are true and the reason is...

4. Assertion : Quasi- Crystals form when certain molten alloys cool very slowly. Reason : Quasi-crystals have shorts range as well as

a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If...

35. Which is the incorrect statement

a. FeO0.98   has non stoichiometric metal deficiency defect b. Density decreases in case of crystals with Schottky’s defect c. NaCl...

10.A brass rod of cross-sectional area

10. A brass rod of cross-sectional area 1cm2  and length 0.2 m is compressed lengthwise by a weight of 5...

9. When shearing force is applied on a body, then the elastic potential energy is stored in it. On removing the force, this energy

(a)  Converts into kinetic energy (b)   Converts into heat energy (c)   Remains as potential energy (d)   None of the above...

8. When strain is produced in a body within elastic limit, its internal energy

(a)  Remains constant                        (b)   Decreases (c)   Increases                           ...

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