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MCQs - Solution - 01

Dr. Vikas Yadav

October 27, 2021 at 4:13:41 PM


Quiz - 01
1. The number of moles of solute present in 1000 gm of the solvent is known as:
(a) Molarity
(b) Molality
(c) Normality
(d) Mole fraction

2. The solubility of a gas varies directly with pressure of the gas, is based upon:
(a) Raoult’s law
(b) Henry’s law
(c) Nernst’s distribution law
(d) None of these

3. Of the following terms used for denoting concentration of a solution, the one which does not gets affected by temperature is:
(a) Molarity
(b) Normality
(c) Molality
(d) Formality

4. The term homogenous mixtures signify that:
(a) Both composition and properties are uniform throughout the mixture.
(b) Its properties are uniform throughout the mixture.
(c) Its composition is uniform throughout the mixture.
(d) Neither composition nor properties are uniform throughout the mixture

5. Determination of correct molecular mass from Raoult’s law is applicable to:
(a) An electrolyte in solution
(b) A non-electrolyte in dilute solution
(c) A non-electrolyte in conc. Solution
(d) An electrolyte in a liquid solvent

6. Molecular weight of non-volatile solute can be determined by:
(a) Victor-Mayer’s method
(b) Graham’s law of diffusion
(c) Gay Lussac’s law
(d) Raoult’s law

7. 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

8. 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

9. 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

10. The elevation in boiling point of a solution of 13·44 gm of CuCl2 in 1 kg of H2O using the following information will be: (Mol. wt. of CuCl2 = 134·4 and Kb = 0·52 K g. mol–1)
(a) 0.16
(b) 0.05
(c) 0.1
(d) 0.2

11. 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

12. 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:
(a) 1.78 × 10–3
(b) 17.43
(c) 0.114
(d) 2.814

13. Which of the following condition is not satisfied by an ideal solution?
(a) ΔHmixing = 0
(b) ΔVmixing = 0
(c) Raoult’s Law is obeyed
(d) Formation of an azeotropic mixture

14. The unit of ebulioscopic constant is:
(a) K kg mol–1 or K (molality)–1
(b) mol kg K–1 or K–1(molality)
(c) kg mol–1 K–1 or K–1(molality)–1
(d) K mol kg–1 or K (molality)

15. A liquid pair of benzene-toluene shows:
(a) Positive deviation from Raoult’s law
(b) Negative deviation from Raoult’s law.
(c) Practically no deviation from Raoult’s law
(d) Irregular deviation from Raoult’s law.

16. Which of the following is not a colligative property?
(a) Depression in freezing point
(b) Elevation in boiling point
(c) Osmotic pressure
(d) Modification of refractive index

17. Which of the following 0·1 M aqueous solution will have the lowest freezing point?
(a) Potassium sulphate
(b) Sodium chloride
(c) Urea
(d) Glucose

18. The osmotic pressure of equimolar solution of NaCl, BaCl2 and glucose will be in the order of :
(a) NaCl > BaCl2 > Glucose
(b) BaCl2 > NaCl > Glucose
(c) Glucose > NaCl > BaCl2
(d) NaCl > Glucose > BaCl2

19. Osmotic pressure of a dilute solution is given by :
(a) P = P0X
(b) pV = nRT
(c) p = VRT
d) None of these

20. Which solution is isotonic to the blood?
(a) 0.75% by weight of NaCl approximately
(b) 0.99% by weight of NaCl approximately
(c) 0.90% by weight of NaCl approximately
(d) None of these

Answers –
1. A 2. B 3. C 4. A
5. B 6. D 7. C
8. B 9. B 10. A
11. A 12. A 13. D
14. A 15. C 16. D
17. A 18. B 19. B 20. C

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