Solutions MCQs for NEET 2026 | Chemistry Practice Test

Solutions – Important MCQs (NEET 2026)

A solution of acetone in ethanol

obeys Raoult's law

shows a negative deviation from Raoult's law

shows a positive deviation from Raoult's law

behaves like a near ideal solution

Vapour pressure of chloroform (CHCl₃) and dichloromethane (CH₂Cl₂) at 25°C are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl₃ and 40 g of CH₂Cl₂ will be

173.9 mm Hg

615.0 mm Hg

90.6 mm Hg

41.5 mm Hg

A solution of urea (mol. mass 56 g mol⁻¹) boils at 100.18°C at atmospheric pressure. The solution will freeze at

0.654°C

−0.654°C

6.54°C

−6.54°C

At 100°C the vapour pressure of a solution of 6.5 g solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point is

102°C

103°C

101°C

100°C

For an ideal solution, the correct option is

Δmix H = 0 at constant T and P

Δmix G = 0 at constant T and P

Δmix S = 0 at constant T and P

Δmix V ≠ 0 at constant T and P

Which aqueous solution will exhibit the highest boiling point?

0.01 M Na₂SO₄

0.015 M C₆H₁₂O₆

0.01 M Urea

0.01 M KNO₃

10 g glucose (P₁), 10 g urea (P₂) and 10 g sucrose (P₃) are dissolved separately in 250 ml water. Decreasing order of osmotic pressure is

P₃ > P₁ > P₂

P₂ > P₁ > P₃

P₁ > P₂ > P₃

P₂ > P₃ > P₁

Henry's law constants (K_H) of gases A, B, C are 145, 2×10⁻⁵ and 35 kbar respectively. Solubility order is

B > A > C

B > C > A

A > C > B

A > B > C

Freezing point depression constant of water is −1.86°C m⁻¹. 5.00 g Na₂SO₄ in 45 g water causes ΔT = −3.82°C. van't Hoff factor is

2.05

2.63

3.11

0.381

Which electrolyte has the same van't Hoff factor as Al₂(SO₄)₃ (100% ionised)?

Al(NO₃)₃

K₄[Fe(CN)₆]

K₂SO₄

K₃[Fe(CN)₆]