Question 1: Palette 1/49

NEET 2026 MCQ

Identify the correct statements :

(A) The molality of 2.5 g of ethanoic acid (Molar mass : $60 \mathrm{~g} \mathrm{~mol}^{-1}$ ) in 75 g of benzene solution is 0.556 m .

(B) The molarity of a solution containing 5 g of NaOH (molar mass : $40 \mathrm{~g} \mathrm{~mol}^{-1}$ ) in 450 mL of solution is 0.278 M at 298 K .

(C) Aquatic species are more comfortable in cold water.

(D) The solubility of gas increases with decrease in pressure.

(E) For a binary mixture of $A$ and $B$, the number of moles of $A$ and $B$ are $n_A$ and $n_B$ respectively. The mole fraction of $B$ will be $x_B=\frac{n_A}{n_A+n_B}$.

Choose the correct answer from the options given below :

A

A, B and C only

B

A and B only

C

A and C only

D

A, D and E only

Question 2: Palette 2/49

NEET 2026 MCQ

Mixture of chloroform and acetone forms a solution with negative deviation from Raoult's law due to :

A

Increase in escaping tendency of molecules of each component.

B

Formation of hydrogen bonding between acetone and chloroform

C

Stronger intermolecular forces between chloroform molecules than those between chloroform and acetone molecules.

D

Repulsive forces.

Question 3: Palette 3/49

NEET 2026 MCQ

Consider the following statements about the solutions formed by mixing two liquids.

A. An ideal solution thus formed obeys Raoult's law throughout the composition range.

B. Mixture of chloroform and acetone shows negative deviation from Raoult's law.

C. Mixture of aniline and phenol shows positive deviation from Raoult's law

A

A and C only

B

A and B only

C

B and C only

D

A only

Question 4: Palette 4/49

NEET 2026 MCQ

Assertion A: For an ideal solution formed by mixing liquids $\mathbf{P}$ and $\mathbf{Q}, \Delta_{\text {mix }} H=0$ and $\Delta_{\text {mix }} V=0$

Reason R: No interactions occur between P and Q

In the light of the above statements, choose the most appropriate answer from the options given below.

A

$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct

B

Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

C

Both $\mathbf{A}$ and $\mathbf{R}$ are correct but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

D

$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct

Question 5: Palette 5/49

NEET 2025 MCQ

Which of the following aqueous solution will exhibit highest boiling point?

A

$0.01 ~\mathrm{M} ~\mathrm{Na}_2 \mathrm{SO}_4$

B

$0.015 \mathrm{~M} ~\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$

C

0.01 M Urea

D

$0.01 \mathrm{M} \mathrm{~KNO}_3$

Question 6: Palette 6/49

NEET 2025 MCQ

Match List-I with List-II

	List - I (Exsample)		List - II (Type of Solution)
A	Humidity	I	Solid in solid
B	Alloys	II	Liquid in gas
C	Amalgams	III	Solid in gas
D	Smoke	IV	Liquid in solid

Choose the correct answer from the options given below:

A

A-III, B-I, C-IV, D-II

B

A-III, B-II, C-I, D-IV

C

A-II, B-IV, C-I,D-III

D

A-II, B-I, C-IV, D-III

Question 7: Palette 7/49

NEET 2025 MCQ

5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure $X$ and $Y$ are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?

A

The solution is ideal.

B

The solution has volume greater than the sum of individual volumes.

C

The solution shows positive deviation.

D

The solution shows negative deviation.

Question 8: Palette 8/49

NEET 2024 MCQ

Mass of glucose $(\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6)$ required to be dissolved to prepare one litre of its solution which is isotonic with $15 \mathrm{~g} \mathrm{~L}^{-1}$ solution of urea $(\mathrm{NH}_3 \mathrm{CONH}_2)$ is (Given: Molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16, \mathrm{~N}: 14$)

A

55 g

B

15 g

C

30 g

D

45 g

Question 9: Palette 9/49

NEET 2024 MCQ

The Henry's law constant $(\mathrm{K}_{\mathrm{H}})$ values of three gases $(\mathrm{A}, \mathrm{B}, \mathrm{C})$ in water are $145, 2 \times 10^{-5}$ and $35 \mathrm{~kbar}$ respectively. The solubility of these gases in water follow the order:

A

B > A > C

B

B > C > A

C

A > C > B

D

A > B > C

Question 10: Palette 10/49

NEET 2024 MCQ

The plot of osmotic pressure (П) vs concentration $(\mathrm{mol} \mathrm{~L}^{-1})$ for a solution gives a straight line with slope $25.73 \mathrm{~L} \mathrm{~bar} \mathrm{~mol}^{-1}$. The temperature at which the osmotic pressure measurement is done is

(Use $\mathrm{R}=0.083 \mathrm{~L} \mathrm{~bar} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$)

A

$37^{\circ} \mathrm{C}$

B

$310^{\circ} \mathrm{C}$

C

$25.73^{\circ} \mathrm{C}$

D

$12.05^{\circ} \mathrm{C}$

Question 11: Palette 11/49

NEET 2023 MCQ

Which amongst the following aqueous solution of electrolytes will have minimum elevation in boiling point? Choose the correct option :-

A

0.05 M NaCl

B

0.1 M KCl

C

0.1 M MgSO$_4$

D

1 M NaCl

Question 12: Palette 12/49

NEET 2022 MCQ

K_H value for some gases at the same temperature 'T' are given :

Gas	K$_H$/k bar
Ar	40.3
CO$_2$	1.67
HCHO	1.83 $\times$ 10$^{ - 5}$
CH$_4$	0.413

where K_H is Henry's Law constant in water. The order of their solubility in water is :

A

HCHO < CH₄ < CO₂ < Ar

B

Ar < CO₂ < CH₄ < HCHO

C

Ar < CH₄ < CO₂ < HCHO

D

HCHO < CO₂ < CH₄ < Ar

Question 13: Palette 13/49

NEET 2021 MCQ

The following solutions were prepared by dissolving 10 g of glucose (C₆H₁₂O₆) in 250 ml of water (P₁), 10 g of urea (CH₄N₂O) in 250 ml of water (P₂) and 10 g of sucrose (C₁₂H₂₂O₁₁) in 250 ml of water (P₃). The right option for the decreasing order of osmotic pressure of these solutions is :

A

P₃ > P₁ > P₂

B

P₂ > P₁ > P₃

C

P₁ > P₂ > P₃

D

P₂ > P₃ > P₁

Question 14: Palette 14/49

NEET 2021 MCQ

The correct option for the value of vapour pressure of a solution at 45$^\circ$C with benzene to octane in molar ratio 3 : 2 is :

[At 45$^\circ$C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]

A

350 mm of Hg

B

160 mm of Hg

C

168 mm of Hg

D

336 mm of Hg

Question 15: Palette 15/49

NEET 2020 MCQ

The freezing point depression constant (K_r) of benzene is 5. 12 K kg mol^-1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is rounded off upto two decimal places :

A

0.80 K

B

0.40 K

C

0.60 K

D

0.20 K

Question 16: Palette 16/49

NEET 2020 MCQ

The mixture which shows positive deviation from Raoult's law is :

A

Benzene + Toluene

B

Acetone + Chloroform

C

Chloroethane + Bromoethane

D

Ethanol + Acetone

Question 17: Palette 17/49

NEET 2019 MCQ

For an ideal solution, the correct option is :

A

$\Delta $_mixH = 0 at constant T and P

B

$\Delta $_mixG = 0 at constant T and P

C

$\Delta $_mixS = 0 at constant T and P

D

$\Delta $_mixV $ \ne $ 0 at constant T and P

Question 18: Palette 18/49

NEET 2019 MCQ

The mixture that forms maximum boiling azeotrope is :

A

Ethanol + Water

B

Acetone + Carbon disulphide

C

Heptane + Octane

D

Water + Nitric acid

Question 19: Palette 19/49

NEET 2017 MCQ

If molality of the dilute solution is doubled, the value of molal depression constant (K_f) will be

A

halved

B

tripled

C

unchanged

D

doubled.

Question 20: Palette 20/49

NEET 2016 MCQ

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

A

0

B

1

C

2

D

3

Question 21: Palette 21/49

NEET 2016 MCQ

Which one of the following is incorrect for ideal solution?

A

$\Delta {H_{mix}} = 0$

B

$\Delta {U_{mix}} = 0$

C

$\Delta P = {P_{obs}} - P$_{calculated by Raoult's law}

D

$\Delta {G_{mix}} = 0$

Question 22: Palette 22/49

NEET 2016 MCQ

At 100^oC the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If K_b = 0.52, the boiling point of this solution will be

A

102^oC

B

103^oC

C

101^oC

D

100^oC

Question 23: Palette 23/49

NEET 2016 MCQ

Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25^oC. (Given, vapour pressure data at 25^oC, benzene = 12.8 kPa, toluene = 3.85 kPa)

A

The vapour eill contain equal amounts of benzene and toluene.

B

Not enough information is given to make a prediction.

C

The vapour will contain a higher percentage of benzene.

D

The vapour will contain a higher percentage of toluene

Question 24: Palette 24/49

NEET 2015 MCQ

Which one of the following electrolytes has the same value of van't Hoff factor (i) as that of Al₂(SO₄)₃ (if all are 100% ionised)?

A

Al(NO₃)₃

B

K₄[Fe(CN)₆]

C

K₂SO₄

D

K₃[Fe(CN)₆]

Question 25: Palette 25/49

NEET 2015 MCQ

The boiling point of 0.2 mol kg^$-$1 solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?

A

Molecular mass of X is less than the molecular mass of Y.

B

Y is undergoing dissociation in water while X undergoes no change.

C

X is undergoing dissociation in water.

D

Molecular mass of X is greater than the molecular mass of Y.

Question 26: Palette 26/49

NEET 2015 MCQ

Which of them is not equal to zero for an ideal solution?

A

$\Delta {V_{mix}}$

B

$\Delta P = {P_{observed}} - {P_{Raoult}}$

C

$\Delta {H_{mix}}$

D

$\Delta {S_{mix}}$

Question 27: Palette 27/49

NEET 2014 MCQ

Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?

A

KCl

B

C₆H₁₂O₆

C

Al₂(SO₄)₃

D

K₂SO₄

Question 28: Palette 28/49

NEET 2013 MCQ

Which condition is not satisfied by an ideal solution?

A

${\Delta _{mix}}\,V = 0$

B

${\Delta _{mix}}\,S = 0$

C

Obeyance to Raoult's Law

D

${\Delta _{mix}}\,H = 0$

Question 29: Palette 29/49

NEET 2012 MCQ

Vapour pressure of chloroform (CHCl₃) and dichloromethane (CH₂Cl₂) at 25^oC 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 at the same temperature will be
(Molecular mass of CHCl₃ = 119.5 u and molecular mass of CH₂Cl₂ = 85 u)

A

173.9 mm Hg

B

615.0 mm Hg

C

90.6 mm Hg

D

285.5 mm Hg

Question 30: Palette 30/49

NEET 2012 MCQ

p_A and p_B are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If x_A represents the mole fraction of component A, the total pressure of the solution will be

A

${p_A} + {x_A}\left( {{p_B} - {p_A}} \right)$

B

${p_A} + {x_A}\left( {{p_A} - {p_B}} \right)$

C

${p_B} + {x_A}\left( {{p_B} - {p_A}} \right)$

D

${p_B} + {x_A}\left( {{p_A} - {p_B}} \right)$

Question 31: Palette 31/49

NEET 2011 MCQ

200 mL of an aqueous solution of a protein contains its 1.26 g. The osmotic pressure of this solution at 300 K is found to be 2.57 $ \times $ 10^$-$3 bar. The molar mass of protein will be (R = 0.083 L bar mol^$-$1 K^$-$1)

A

51022 g mol^$-$1

B

122044 g mol^$-$1

C

31011 g mol^$-$1

D

61038 g mol^$-$1

Question 32: Palette 32/49

NEET 2011 MCQ

A 0.1 molal aqueous solution of a weak acid is 30% ionized. If K_f for water is 1.86^oC/m, the freezing point of the solution will be

A

$-$0.18^oC

B

$-$0.54^oC

C

$-$0.36^oC

D

$-$0.24^oC

Question 33: Palette 33/49

NEET 2011 MCQ

The freezing point depression constant for water is $-$1.86^o C m^$-$1. If 5.00 g Na₂SO₄ is dissolved in 45.0 g H₂O, the freezing point is changed by $-$3.82^oC. Calculate the van't Hoff factor for Na₂SO₄.

A

2.05

B

2.63

C

3.11

D

0.381

Question 34: Palette 34/49

NEET 2011 MCQ

The van't Hoff factor $i$ for a compound which undergoes dissociation in one solvent and association in other solvent is respectively

A

less than one and greater than one

B

less than one and less than one

C

greater than one and less than one

D

greater than one and greater than one.

Question 35: Palette 35/49

NEET 2010 MCQ

A solution of sucrose (molar mass = 342 g mol^$-$) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water. The freezing point of the solution obtained will be (K_f for water = 1.86 K kg mol^$-$1)

A

$-$ 0.372^oC

B

$-$ 0.520^oC

C

+ 0.372^oC

D

$-$ 0.570^oC

Question 36: Palette 36/49

NEET 2010 MCQ

An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

A

Addition of NaCl

B

Addition of Na₂SO₄

C

Addition of 1.00 molal KI

D

Addition of water

Question 37: Palette 37/49

NEET 2009 MCQ

A 0.0020 m aqueous solution of an ionic compound [Co(NH₃)₅(NO₂)]Cl freezes at $-$ 0.00732^oC. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be (K_f = $-$1.86^oC/m)

A

3

B

4

C

1

D

2

Question 38: Palette 38/49

NEET 2007 MCQ

0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If K_f for water is 1.86 K kg mol^$-$1, the lowering in freezing point of the solution is

A

0.56 K

B

1.12 K

C

$-$ 0.56 K

D

$-$ 1.12 K

Question 39: Palette 39/49

NEET 2006 MCQ

A solution of acetone in ethanol

A

obeys Raoult's law

B

shows a negative deviation from Raoult's law

C

shows a positive deviation from Raoult's law

D

behaves like a near ideal solution.

Question 40: Palette 40/49

NEET 2006 MCQ

During osmosis, flow of water through a semipermeable membrane is

A

from solution having lower concentration only

B

from solution having higher concentration only

C

from both sides of semipermeable membrane with equal flow rates

D

from both sides of semipermeable membrane with unequal flow rates.

Question 41: Palette 41/49

NEET 2006 MCQ

1.00 g of a non-electrolyte solute (molar mass 250 g mol^$-$1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, K_f of benzene is 5.12 K kg mol^$-$1, the freezing point of benzene will be lowered by

A

0.2 K

B

0.4 K

C

0.3 K

D

0.5 K

Question 42: Palette 42/49

NEET 2006 MCQ

A solution containing 10 g per dm³ of urea (molecular mass = 60 g mol^$-$1) is isotonic with a 5% solution of a nonvolatile solute is

A

200 g mol^$-$1

B

250 g mol^$-$1

C

300 g mol^$-$1

D

350 g mol^$-$1

Question 43: Palette 43/49

NEET 2005 MCQ

A solution of urea (mol. mass 56 g mol^$-$1) boils at 100.18^oC at the atmospheric pressure. If K_f and K_b for water are 1.86 and 0.512 K kg mol^$-$1 respectively, the above solution will freeze at

A

0.654^oC

B

$-$ 0.654^oC

C

6.54^oC

D

$-$6.54^oC

Question 44: Palette 44/49

NEET 2005 MCQ

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20^oC are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be

A

0.200

B

0.549

C

0.786

D

0.478

Question 45: Palette 45/49

NEET 2005 MCQ

The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be

A

72 torr

B

140 torr

C

68 torr

D

20 torr

Question 46: Palette 46/49

NEET 2002 MCQ

A solution contains non volatile solute of molecular mass M₂. Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure?

A

${M_2} = \left( {{{{m_2}} \over \pi }} \right)VRT$

B

${M_2} = \left( {{{{m_2}} \over V}} \right){{RT} \over \pi }$

C

${M_2} = \left( {{{{m_2}} \over V}} \right)\pi RT$

D

${M_2} = \left( {{{{m_2}} \over V}} \right){\pi \over {RT}}$

Question 47: Palette 47/49

NEET 2002 MCQ

A solution containing components A and B folloes Raoult's law

A

A - B attraction force is greater than A - A and B - B

B

A - B attraction force is less than A - A and B - B

C

A - B attraction force remains same as A - A and B - B

D

volume of solution is different from sum of volume of solute and solvent.

Question 48: Palette 48/49

NEET 2001 MCQ

Pure water can be obtained from sea water by

A

centrifugation

B

plasmolysis

C

reverse osmosis

D

sedimentation

Question 49: Palette 49/49

NEET 2000 MCQ

From the colligative properties of solution, which one is the best method for the determination of molecular weight of proteins and polymers?

A

Osmotic pressure

B

Lowering in vapour pressure

C

Lowering in freezing point

D

Elevation in boiling point