Solutions · Chemistry · NEET
MCQ (Single Correct Answer)
1
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 $$\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16, \mathrm{~N}: 14$$)
NEET 2024 (Re-Examination)
2
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:
NEET 2024
3
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 $$\mathrm{R}=0.083 \mathrm{~L} \mathrm{~bar} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$$)
NEET 2024
4
Which amongst the following aqueous solution of electrolytes will have minimum elevation in boiling point? Choose the correct option :-
NEET 2023 Manipur
5
KH 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 KH is Henry's Law constant in water. The order of their solubility in water is :
NEET 2022 Phase 2
6
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 :
NEET 2021
7
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]
[At 45$$^\circ$$C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]
NEET 2021
8
The freezing point depression constant (Kr) 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 :
NEET 2020 Phase 1
9
The mixture which shows positive deviation from Raoult's law is :
NEET 2020 Phase 1
10
For an ideal solution, the correct option is :
NEET 2019
11
The mixture that forms maximum boiling
azeotrope is :
NEET 2019
12
If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be
NEET 2017
13
The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is
NEET 2016 Phase 2
14
Which one of the following is incorrect for ideal solution?
NEET 2016 Phase 2
15
At 100oC the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be
NEET 2016 Phase 1
16
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 25oC. (Given, vapour pressure data at 25oC, benzene = 12.8 kPa, toluene = 3.85 kPa)
NEET 2016 Phase 1
17
Which of them is not equal to zero for an ideal solution?
AIPMT 2015 Cancelled Paper
18
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)?
AIPMT 2015 Cancelled Paper
19
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?
AIPMT 2015 Cancelled Paper
20
Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?
AIPMT 2014
21
Which condition is not satisfied by an ideal solution?
NEET 2013 (Karnataka)
22
Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25oC 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)
(Molecular mass of CHCl3 = 119.5 u and molecular mass of CH2Cl2 = 85 u)
AIPMT 2012 Mains
23
pA and pB are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If xA represents the mole fraction of component A, the total pressure of the solution will be
AIPMT 2012 Prelims
24
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)
AIPMT 2011 Mains
25
A 0.1 molal aqueous solution of a weak acid is 30% ionized. If Kf for water is 1.86oC/m, the freezing point of the solution will be
AIPMT 2011 Mains
26
The van't Hoff factor $$i$$ for a compound which undergoes dissociation in one solvent and association in other solvent is respectively
AIPMT 2011 Prelims
27
The freezing point depression constant for water is $$-$$1.86o C m$$-$$1. If 5.00 g Na2SO4 is dissolved in 45.0 g H2O, the freezing point is changed by $$-$$3.82oC. Calculate the van't Hoff factor for Na2SO4.
AIPMT 2011 Prelims
28
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 (Kf for water = 1.86 K kg mol$$-$$1)
AIPMT 2010 Prelims
29
An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?
AIPMT 2010 Prelims
30
A 0.0020 m aqueous solution of an ionic compound [Co(NH3)5(NO2)]Cl freezes at $$-$$ 0.00732oC. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be (Kf = $$-$$1.86oC/m)
AIPMT 2009
31
0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If Kf for water is 1.86 K kg mol$$-$$1, the lowering in freezing point of the solution is
AIPMT 2007
32
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, Kf of benzene is 5.12 K kg mol$$-$$1, the freezing point of benzene will be lowered by
AIPMT 2006
33
During osmosis, flow of water through a semipermeable membrane is
AIPMT 2006
34
A solution of acetone in ethanol
AIPMT 2006
35
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
AIPMT 2006
36
A solution of urea (mol. mass 56 g mol$$-$$1) boils at 100.18oC at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol$$-$$1 respectively, the above solution will freeze at
AIPMT 2005
37
A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20oC are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be
AIPMT 2005
38
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
AIPMT 2005
39
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?
AIPMT 2002
40
A solution containing components A and B folloes Raoult's law
AIPMT 2002
41
Pure water can be obtained from sea water by
AIPMT 2001
42
From the colligative properties of solution, which one is the best method for the determination of molecular weight of proteins and polymers?
AIPMT 2000