Solutions - NCERT Based MCQs for NEET

This article contains NCERT based 45 MCQ questions test on Chemistry chapter "Solutions". You can attempt these questions in the form of an interactive quiz and calculate your score. Read the below quiz rules carefully before you start

General Instructions

• Quiz contains 45 questions of 4 marks each.
• Correct answer (✔) will award you +4 marks and Incorrect answer (✘) will give you -1 mark.
• Total test is of 180 marks.
• Tap on box in order to select any option that you think is correct.
• Press the Submit button given in the end of quiz to calculate your score.
• There is a PDF file attached in the end of quiz. You can see detailed solutions to all questions and do self analysis from that file as well. 

Question 1. Which of the following is not a colligative property–
(1) Osmotic pressure
(2) Elevation in boiling point
(3) Vapor pressure
(4) Depression in freezing point

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Question 2. Osmotic pressure of a urea solution at 10°C is 500mm Osmotic pressure of the solution become 105.3 mm. When it is diluted and temperature raised to 25°C. The extent of dilution is –
(1) 6 Times
(2) 5 Times
(3) 7 Times
(4) 4 Times

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Question 3. For an aqueous solution, freezing point is –0.186°C. Elevation of the boiling point of the same solution is (Kf = 1.86° mol^–1 kg) and Kb = 0.512° mol^–1 kg)
(1) 0.186°
(2) 0.0512°
(3) 1.86°
(4) 5.12°

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Question 4. A 5% solution (w/W) of cane sugar (molar mass = 342 g mol^–1) has freezing point 271 K. What will be the freezing point of 5% glucose (molar mass = 180 g mol^–1) in water if freezing point of pure water is 273.15 K?
(1) 273.07K
(2) 269.07 K
(3) 273.15K
(4) 260.09 K

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Question 5. In a 0.2 molal aqueous solution of a weak acid HX the degree of ionization is 0.3. Taking kf for water as 1.85, the freezing point of the solution will be nearest to –
(1) – 0.260°C
(2) + 0.480°C
(3) – 0.480°C
(4) – 0.360°C

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Question 6. 25 ml of a solution of barium hydroxide required 35 ml on titration with a 0.1 molar solution of hydrochloric acid. Molarity of barium hydroxide solution was –
(1) 0.28
(2) 0.35
(3) 0.07
(4) 0.14

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Question 7. Which one of the following aqueous solutions will exhibit highest boiling point ?
(1) 0.01 M Na₂SO₄
(2) 0.01 M KNO₃
(3) 0.015 M urea
(4) 0.015 M glucose

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Question 8. To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H₃PO₃), the volume of 0.1 M aqueous KOH solution required is –
(1) 10 mL
(2) 20 mL
(3) 40 mL
(4) 60 mL

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Question 9. Which of the following liquid pairs shows a positive deviation from Raoult’s law?
(1) Water-hydrochloric acid
(2) Benzene-methanol
(3) Water-nitric acid
(4) Acetone-chloroform

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Question 10. Which one of the following statements is false?
(1) Raoult’s law states that the vapor pressure of a component over a solution is proportional to its mole fraction.
(2) The osmotic pressure (π) of a solution is given by the equation π = MRT where M is the molarity of the solution
(3) The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl₂ > KCl > CH3COOH > sucrose.
(4) Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.

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Question 11. Benzene and toluene form nearly ideal solutions. At 20°C, the vapor pressure of benzene is 75torr and that of toluene is 22 torr. The partial vapor pressure of benzene at 20°C for a solution containing 78 g of benzene and 46 g of toluene in torr is –
(1) 25
(2) 50
(3) 53.5
(4) 37.5

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Question 12. Two solutions of a substance (nonelectrolyte) are mixed in the following manner. 480 ml of 1.5M first solution + 520 mL of 1.2M second solution. What is the molarity of the final mixture?
(1) 1.50 M
(2) 1.20 M
(3) 2.70 M
(4)1.344 M

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Question 13. Equimolal solutions in the same solvent have
(1) Same freezing point but different boiling point
(2) Same boiling point but different freezing point2
(3) Different boiling and different freezing point
(4) Same boiling and same freezing points

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Question 14. 18 g of glucose (C₆H₁₂O₆) is added to 178.2 g of water. The vapor pressure of water for this aqueous solution at 100° C
(1) 7.60 Torr
(2) 76.00 Torr
(3) 752.40 Torr
(4) 759.00 Torr

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Question 15. Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is -
(1) 3.28 mol kg^–1
(2) 2.28 mol kg^–1
(3) 0.44 mol kg^–1
(4) 1.14 mol kg^–1

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Question 16. We have three aqueous solutions of NaCl labelled as 'A', 'B' and 'C' with concentrations 0.1 M, 0.01 M & 0.001 M, respectively. The value of Van’t Hoff factor for these solutions will be in the order.
(1) i_A < i_B < i_C
(2) i_A > i_B > i_C
(3) i_A = i_B = i_C
(4) i_A < i_B > i_C

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Question 17. The density of a solution prepared by dissolving 120 g of urea (mol. mass = 60 u) in 1000 g of water is 1.15 g/mL. The molarity of this solution is
(1) 0.50 M
(2) 1.78 M
(3) 1.02 M
(4) 2.05 M

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Question 18. K_f for water is 1.86 K kg mol^–1. If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C₂H₆O₂) must you add to get the freezing point of the solution lowered to –2.8°C ?
(1) 72 g
(2) 93 g
(3) 39 g
(4) 27 g

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Question 19. The molarity of a solution obtained by mixing 750 mL of 0.5(M) HCl with 250 mL of 2(M) HCl will be –
(1) 0.875 M
(2) 1.00 M
(3) 1.75 M
(4) 0.975 M

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Question 20. In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M MgCl₂ solution is –
(1) the same
(2) about twice
(3) about three times
(4) about six times.

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Question 21. The decreasing order of osmotic pressures of 10g glucose (P₁), 10g urea (P₂) and 10g sucrose (P₃) at 273 K when dissolved in 250mL of water separately is –
(1) P₁ > P₂ > P₃
(2) P₂ > P₃ > P₁
(3) P₂ > P₁ > P₃
(4) P₃ > P₂ > P₁

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Question 22. 4 L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is –
(1) 0.004
(2) 0.008
(3) 0.012
(4) 0.016

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Question 23. 50 mL of 10 N H₂SO₄, 25 mL of 12 N HCl and 40 mL of 5N HNO₃ are mixed and the volume of the mixture is made 1000 mL by adding water. The normality of resulting solution will be –
(1) 1 N
(2) 2 N
(3) 9 N
(4) 4 N

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Question 24. Arrange the following aqueous solutions in the order of their increasing boiling points (i) 10^–4 M NaCl (ii) 10^–4 M Urea (iii) 10^–3 M MgCl₂ (iv) 10^–2 M NaCl
(1) (i) < (ii) < (iv) < (iii)
(2) (ii) < (i) = (iii) < (iv)
(3) (ii) < (i) < (iii) < (iv)
(4) (iv) < (iii) < (i) = (ii)

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Question 25. What is the mole fraction of glucose in 10% w/W glucose solution?
(1) 0.01
(2) 0.02
(3) 0.03
(4) 0.04

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Question 26. Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult's law?
(1) Methanol and acetone
(2) Chloroform and acetone
(3) Nitric acid and water
(4) Phenol and aniline

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Question 27. Which of the following 0.10 m aqueous solution will have the lowest freezing point?
(1) Al₂(SO₄)₃
(2) C₅H₁₀O₅
(3) KI
(4) C₁₂H₂₂O₁₁

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Question 28. Vapor pressure of a pure liquid X is 2 atm at 300K. 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?
(1) 20
(2) 50
(3) 100
(4) 200

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Question 29. K_H values for Ar (g), CO₂(g), HCHO (g) and CH₄(g) are 40.39, 1.67, 1.83 × 10^–5 and 0.413 respectively. Arrange these gases in the order of their increasing solubility.
(1) HCHO < CH₄ < CO₂ < Ar
(2) HCHO < CO₂ < CH₄ < Ar
(3) Ar < CO₂ < CH₄ < HCHO
(4) Ar < CH₄ < CO₂ < HCHO

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Question 30. The value of Henry’s constant K_H is –
(1) greater for gases with higher solubility
(2) greater for gases with lower solubility
(3) constant for all gases
(4) not related to the solubility of gases

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Question 31. The order of increasing freezing point of C₂H₅OH, Ba₃(PO₄)₂, Na₂SO₄, KCl & Li₃O₄ is
(1) Ba₃(PO₄)₂ < Na₂SO₄ < Li₃PO₄ < C₂H₅OH < KCl
(2) Ba₃(PO₄)₂ < C₂H₅OH < Li₃PO₄ < Na₂SO₄ < KCl
(3) C₂H₅OH < KCl < Na₂SO₄ < Ba₃(PO₄)₂ < Li₃PO₄
(4) Ba₃(PO₄)₂ < Li₃PO₄ < Na₂SO₄ < KCl < C₂H₅OH

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Question 32. What will be the freezing point of a 0.5 m KCl solution? The molal freezing point constant of water is 1.86 °Cm^–1
(1) –1.86°C
(2) –0.372°C
(3) –3.2°C
(4) 0°C

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Question 33. Which of the following aqueous solutions should have the highest boiling point?
(1) 1.0 M NaOH
(2) 1.0 M Na₂SO₄
(3) 1.0 M NH₄NO₃
(4) 1.0 M KNO₃

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Question 34. A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?
(1) 91.8 g
(2) 1198 g
(3) 83.9 g
(4) 890.3 g

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Question 35. The value of Henry’s law constant for some gases at 293 K is given below. Arrange the gases in the increasing order of their solubility.
He : 144.97 k bar,
H₂ : 69.16 k bar,
N₂ : 76.48 k bar,
O₂ : 34.86 k bar
(1) He < N₂ < H₂ < O₂
(2) O₂ < H₂ < N₂ < He
(3) H₂ < N₂ < O₂ < He
(4) He < O₂ < N₂ < H₂

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Question 36. Which has the highest freezing point?
(1) 1 M glucose
(2) 1 M NaCl
(3) 1M CaCl₂
(4) 1M AlF₃

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Question 37. The values of Van’t Hoff factors for KCl, NaCl and K₂SO₄, respectively, are –
(1) 2, 2 and 2
(2) 2, 2 and 3
(3) 1, 1 and 2
(4) 1, 1 and 1

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Question 38. Which of the following binary mixtures will have same composition in liquid and vaporphase?
(i) Ethanol + Chloroform
(ii) Nitric acid + Water
(iii) Benzene + Toluene
(iv) Ethyl chloride + Ethyl bromide
(1) (i) and (iii)
(2) (i) and (ii)
(3) (i), (ii) and (iii)
(4) (iii) and (iv)

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Question 39. Lowering of vapor pressure, Δp: elevation in boiling ΔTb: and depression in freezing point, ΔT_f of a solvent for the same molar concentration of each of the three solutes:
(a) sugar,
(b) NaCl,
(c) BaCl₂ follow the sequence:

(1) Δp : a < b < c
(2) ΔT_b : c > b > a
(3) ΔT_f : a < b < c
(4) all of these

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Question 40. The vapor pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapor pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be
(1) 72 torr
(2) 140 torr
(3) 68 torr
(4) 20 torr

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Question 41. A solution of urea (mol. mass 56 g mol^–1) boils at 100.18°C at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 Kkgmol^–1 respectively, the above solution will freeze at –
(1) 0.654°C
(2) – 0.654°C
(3) 6.54°C
(4) – 6.54°C

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Question 42. The mole fraction of the solute in one mol molal aqueous solution is –
(1) 0.009
(2) 0.018
(3) 0.027
(4) 0.036

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Question 43. A solution has a 1 : 4 mole ratio of pentane to hexane. The vapor pressures of the pure hydrocarbons at 20°C are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapor phase would
(1) 0.549
(2) 0.200
(3) 0.786
(4) 0.478

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Question 44. A solution containing 10g per dm³ of urea (molecular mass = 60g mol^–1) is isotonic with a 5% solution of a non-volatile solute. The molecular mass of this nonvolatile solute is –
(1) 300g mol^–1
(2) 350 g mol^–1
(3) 200g mol^–1
(4) 250g mol^–1

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Question 45. 1.00g of a non-electrolyte solute (molar mass 250 g mol^–1) was dissolved in 51.2g of benzene. If the freezing point depression constant Kf of benzene is 5.12 K kg mol^–1, the freezing point of benzene will be lowered by-
(1) 0.3 K
(2) 0.5 K
(3) 0.4 K
(4) 0.2 K

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Detailed Solutions

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