Solutions NEET Previous Year Questions (PYQs)
Practice NEET previous year questions from Solutions. These chapter-wise MCQs include answers and clear explanations to strengthen conceptual understanding.
👉 Read theory:
Solutions Chapter Notes
Q1. If the molality of a dilute solution is doubled, the value of molal depression constant (Kf) will be:
(NEET 2017)
- (A) Halved
- (B) Tripled
- (C) Unchanged
- (D) Doubled
Show Answer
(C)
Show Explanation
Kf depends only on the nature of the solvent, not on concentration.
Q2. Which of the following concentration terms depends on temperature?
(NEET 2017)
- (A) Molarity
- (B) Molality
- (C) Mole fraction
- (D) Weight %
Show Answer
(A)
Show Explanation
Molarity depends on volume, which changes with temperature.
Q3. The van’t Hoff factor for a dilute aqueous solution of Ba(OH)2 is:
(NEET 2016)
- (A) 1
- (B) 2
- (C) 3
- (D) 4
Show Answer
(C)
Show Explanation
Ba(OH)2 dissociates into Ba2+ + 2OH−, giving 3 ions.
Q4. Which statement is incorrect for an ideal solution?
(NEET 2016)
- (A) ΔHmix = 0
- (B) ΔVmix = 0
- (C) Obeys Raoult’s law
- (D) Strong attraction between unlike molecules
Show Answer
(D)
Show Explanation
In ideal solutions, A–A, B–B and A–B interactions are similar, not strong.
Q5. Vapour over an ideal equimolar mixture of benzene and toluene will contain:
(NEET 2016)
- (A) Equal amounts
- (B) More toluene
- (C) More benzene
- (D) Cannot be predicted
Show Answer
(C)
Show Explanation
Benzene has higher vapour pressure, so vapour phase is richer in benzene.
Q6. Which solution shows maximum depression in freezing point?
(NEET 2014)
- (A) 0.1 m KCl
- (B) 0.1 m glucose
- (C) 0.1 m Al2(SO4)3
- (D) 0.1 m K2SO4
Show Answer
(C)
Show Explanation
Al2(SO4)3 gives maximum number of ions → highest colligative effect.
Q7. Which colligative property is best for determining molar mass of proteins?
(NEET 2000)
- (A) Elevation in boiling point
- (B) Depression in freezing point
- (C) Osmotic pressure
- (D) Lowering of vapour pressure
Show Answer
(C)
Show Explanation
Osmotic pressure is effective even in very dilute solutions of macromolecules.
Q8. Isotonic solutions have the same:
(NEET 2020)
- (A) Vapour pressure
- (B) Freezing point
- (C) Osmotic pressure
- (D) Boiling point
Show Answer
(C)
Show Explanation
Isotonic solutions have equal osmotic pressure.
Q9. Which solution shows positive deviation from Raoult’s law?
(NEET 2023)
- (A) Benzene + Toluene
- (B) Acetone + Chloroform
- (C) Ethanol + Acetone
- (D) Water + Nitric acid
Show Answer
(C)
Show Explanation
Positive deviation occurs when A–B interactions are weaker than A–A and B–B.
Q10. Blood cells retain their normal shape in:
(NEET 1991)
- (A) Hypotonic solution
- (B) Hypertonic solution
- (C) Isotonic solution
- (D) Concentrated solution
Show Answer
(C)
Show Explanation
Isotonic solutions have same osmotic pressure as blood cells.
Q11. Relative lowering of vapour pressure is equal to:
(NEET 1995)
- (A) Mole fraction of solute
- (B) Mole fraction of solvent
- (C) Mass fraction
- (D) Normality
Show Answer
(A)
Show Explanation
According to Raoult’s law, relative lowering equals mole fraction of solute.
Q12. Which concentration unit is temperature independent?
(NEET)
- (A) Molarity
- (B) Normality
- (C) Molality
- (D) Strength
Show Answer
(C)
Show Explanation
Molality depends on mass, not volume.
Q13. Sea water is converted into drinking water by:
(NEET 2001)
- (A) Distillation
- (B) Reverse osmosis
- (C) Sedimentation
- (D) Dialysis
Show Answer
(B)
Show Explanation
Reverse osmosis removes dissolved salts using semipermeable membranes.
Q14. Which colligative property is used in osmosis?
(NEET)
- (A) Vapour pressure
- (B) Boiling point
- (C) Freezing point
- (D) Osmotic pressure
Show Answer
(D)
Show Explanation
Osmosis is governed by osmotic pressure.
Q15. Which solution has lowest freezing point?
(NEET 1997)
- (A) 0.01 m NaCl
- (B) 0.005 m glucose
- (C) 0.005 m urea
- (D) 0.005 m NaCl
Show Answer
(A)
Show Explanation
NaCl dissociates and gives more particles, increasing depression.
Q16. Ideal solutions show:
(NEET 1988)
- (A) ΔH ≠ 0
- (B) ΔV ≠ 0
- (C) ΔH = 0 and ΔV = 0
- (D) Large deviation
Show Answer
(C)
Show Explanation
Ideal solutions have zero enthalpy and volume change on mixing.
Q17. Maximum boiling azeotrope is formed by:
(NEET 2019)
- (A) Water + Nitric acid
- (B) Ethanol + Water
- (C) Acetone + CS2
- (D) Benzene + Toluene
Show Answer
(A)
Show Explanation
Maximum boiling azeotrope shows negative deviation from Raoult’s law.
Q18. Isotonic solutions have equal:
(NEET)
- (A) Freezing point
- (B) Vapour pressure
- (C) Osmotic pressure
- (D) Boiling point
Show Answer
(C)
Show Explanation
Definition of isotonic solutions.
Q19. Which mixture behaves ideally?
(NEET)
- (A) Benzene + Toluene
- (B) Ethanol + Water
- (C) Acetone + Chloroform
- (D) Water + HCl
Show Answer
(A)
Show Explanation
Benzene and toluene have similar molecular interactions.
Q20. Colligative properties depend on:
(NEET)
- (A) Nature of solute
- (B) Nature of solvent
- (C) Number of solute particles
- (D) Chemical nature
Show Answer
(C)
Show Explanation
Colligative properties depend only on number of solute particles.
👉 More Solutions NEET PYQs will be added gradually.