Welcome to your Solutions MCQs Mock Test of Class 12th Chemistry
1.
Q1. . People add sodium chloride to water while boiling eggs. This is to
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Q2. The van’t Hoff factor (i) accounts for
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Q3. Osmotic pressure of a solution is 0.0821 atm at a temperature of 300 K. The concentration in moles/litre will be
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Q4. The molal elevation constant depends upon
5.
Q.5. Which of the following fluoride is used as rat poison?
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Q.6. Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 g of Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?
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Q.7. Most of the processes in our body occur in
8.
Q.8. The term homogenous mixtures signifies that
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Q.9. Which of the following units is useful in relating concentration of solution with its vapour pressure?
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Q.10. Which of the following mixture is(are) called solution? (i) water + ammonia (ii) water + acetone (iii) acetone + alcohol (iv) hexane + water
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Q.11. Low concentration of oxygen in the blood and tissues of people living at high altitude is due to _.
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Q.12. Value of Henry’s constant KH _.
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Q.13. The value of Henry’s constant KH is _.
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Q.14. A plant cell shrinks when it is kept in a
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Q.15. The relative lowering in vapour pressure is proportional to the ratio of number of
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Q.16. Which of the following is a quantitative description of the solution?
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Q.17. When a solute is present in trace quantities the following expression is used
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Q.18. The law which indicates the relation’-hip between solubility of a gas in liquid and pressure rs
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Q.19. Molarity of liquid HCl will be, if density of solution is 1.17 gm/cc
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Q.20. 1 M, 2.5 litre NaOH solution is mixed with another 0.5 M, 3 litre NaOH solution. Then find out the molarity of resultant solution
21.
Q.21. How much oxygen is dissolved in 100 rnL water at 298 K if partial pressure of oxygen is 0.5 atm and K = 1.4 × 10-3 mol/L/atm?
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Q.22. An X molal solution of a compound in benzene has mole fraction of solute equal to 0.2. The value of X is
23.
Q.23. The molarity of the solution containing 7.1 g of Na2SO4 in 100 ml of aqueous solution is
24.
Q.24. Partial pressure of a solution component is directly proportional to its mole fraction. This is known as
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Q.25. 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?
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Q.26. Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved in the process is
27.
Q.27. Which of the following solutions shows positive deviation from Raoult’s law?
28.
Q.28. The system that forms maximum boiling azetrope is
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Q.29. A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?
30.
Q.30. What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10°C ?
31.
Q.31. The osmotic pressure of a solution can be increased by
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Q.32. For carrying reverse osmosis for desalination of water the material used for making semipermeable membrane is
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Q.33. What will be the degree of dissociation of 0.1 M Mg(NO3)2 solution if van’t Hoff factor is 2.74?
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Q.34. At equilibrium the rate of dissociation of a solid solute in a volatile liquid solvent is
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Q.35. If 2 gm of NaOH is present is 200 ml of its solution, its molarity will be
36.
Q.36. The atmospheric pollution is generally measured in the units of
37.
Q.37. A 5% solution of cane-sugar (molecular weight = 342) is isotonic with 1% solution of substance A. The molecular weight of X is
38.
Q.38. 234.2 gm of sugar syrup contains 34.2 gm of sugar. What is the molal concentration of the solution.
39.
Q.39. H2S is a toxic gas used in qualitative analysis. If solubility of H2S in water at STP is 0.195 m. what is the value of KH?
40.
Q.40. Atomic mass is equal to
41.
Q.41. Henry’s law constant for molality of methane is benzene at 298 K is 4.27 × 105 mm Hg. The mole fraction of methane in benzene at 298 K under 760 mm Hg is
42.
Q.42. Among the following substances the lowest vapour pressure is exerted by
43.
Q43. At equillibrium the rate of dissolution of a solid solute in a volatile liquid solvent is __.
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Q.44. A beaker contains a solution of substance ‘A’. Precipitation of substance ‘A’ takes place when small amount of ‘A’ is added to the solution. The solution is __.
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Q.45. Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon ________.
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Q46. Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is
47.
Q47. Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are
48.
Q48. Which of the following condition is not satisfied by an ideal solution?
49.
Q49. The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows
50.
Q50. Which has the lowest boiling point at 1 atm pressure?
