Solutions PYQs - Last 10 Years

The elevation in boiling point for 1 molal solution of non-volatile solute A is \(3 \mathrm{~K}\). The depression in freezing point for 2 molal solution of \(\mathrm{A}\) in the same solvent is 6 \(K\). The ratio of \(K_{b}\) and \(K_{f}\) ...

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2\(^\circ\)C. The percentage association of solute A in water, is :
[Given : Molar mass of A = 93 g mol\(-\)1. Molal ...

The depression in freezing point observed for a formic acid solution of concentration \(0.5 \mathrm{~mL} \mathrm{~L}^{-1}\) is \(0.0405^{\circ} \mathrm{C}\). Density of formic acid is \(1.05 \mathrm{~g} \mathrm{~mL}^{-1}\). The Van't Hoff f...

Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y, respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1 : 4. The ratio of molar masses of X and Y is

The osmotic pressure of blood is 7.47 bar at 300 K. To inject glucose to a patient intravenously, it has to be isotonic with blood. The concentration of glucose solution in gL\(-\)1 is _____________.
(Molar mass of glucose = 180 g mol\(-\)1...

A company dissolves 'x' amount of CO2 at 298 K in 1 litre of water to prepare soda water. X = __________ \(\times\) 10\(-\)3 g. (nearest integer)
(Given : partial pressure of CO2 at 298 K = 0.835 bar.
Henry's law constant for CO2 at 298 K =...

Which one of the following 0.10 M aqueous solutions will exhibit the largest freezing point depression?

1.22 g of an organic acid is separately dissolved in 100 g of benzene (Kb = 2.6 K kg mol\(-\)1) and 100 g of acetone (Kb = 1.7 K kg mol\(-\)1). The acid is known to dimerize in benzene but remain as a monomer in acetone. The boiling point o...

1.46 g of a biopolymer dissolved in a 100 mL water at 300 K exerted an osmotic pressure of 2.42 \(\times\) 10\(-\)3 bar.The molar mass of the biopolymer is _____________ \(\times\) 104 g mol\(-\)1. (Round off to the Nearest Integer)[Use : R...

In a solvent 50% of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is __________ \(\times\) 10\(-\)2.(Round off to the nearest integer)

1 kg of 0.75 molal aqueous solution of sucrose can be cooled up to \(-\)4\(^\circ\)C before freezing. The amount of ice (in g) that will be separated out is __________. (Nearest integer)[Given : Kf(H2O) = 1.86 K kg mol\(-\)1]

40 g of glucose (Molar mass = 180) is mixed with 200 mL of water. The freezing point of solution is __________ K. (Nearest integer) [Given : Kf = 1.86 K kg mol\(-\)1; Density of water = 1.00 g cm\(-\)3; Freezing point of water = 273.15 K]

224 mL of SO2(g) at 298 K and 1 atm is passed through 100 mL of 0.1 M NaOH solution. The non-volatile solute produced is dissolved in 36g of water. The lowering of vapour pressure of solution (assuming the solution in dilute) (P$$_{({H_2}O)...

When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be \(-\)0.93\(^\circ\)C (Kf(H2O) = 1.86 K kg mol\(-\)1). The number (n) of benzoic acid molecules associated (assuming 100% association)...

Of the following four aqueous solutions, total number of those solutions whose freezing point is lower than that of 0.10 M C2H5OH is __________ (Integer answer)(i) 0.10 M Ba3(PO4)2(ii) 0.10 M Na2SO4(iii) 0.10 M KCl(iv) 0.10 M Li3PO4

83 g of ethylene glycol dissolved in 625 g of water. The freezing point of the solution is ____________ K. (Nearest integer)[Use : Molal Freezing point depression constant of water = 1.86 K kg mol\(-\)1]Freezing Point of water = 273 KAtomic...

CO2 gas is bubbled through water during a soft drink manufacturing process at 298 K. If CO2 exerts a partial pressure of 0.835 bar then x m mol of CO2 would dissolve in 0.9 L of water. The value of x is ____________. (Nearest integer)(Henry...

When 3.00 g of a substance 'X' is dissolved in 100 g of CCl4, it raises the boiling point by 0.60 K. The molar mass of the substance 'X' is ______________ g mol\(-\)1. (Nearest integer).[Given Kb for CCl4 is 5.0 K kg mol\(-\)1]

1 molal aqueous solution of an electrolyte A2B3 is 60% ionised. The boiling point of the solution at 1 atm is _________ K. (Rounded off to the nearest integer)[Given Kb for (H2O) = 0.52 K kg mol\(-\)1]

If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ____________ molal. (Rounded off to the nearest integer)[Kb = 0.52 K kg ...

When 9.45 g of CICH2COOH is added to 500 mL of water, its freezing point drops by 0.5°C. The dissociation constant of CICH2COOH is x \(\times\) 10-3. The value of x is ________. (Rounded
off to the nearest integer)
[Kf(H20) = 1.86 K kg mo...

C6H6 freezes at 5.5\(^\circ\)C. The temperature at which a solution of 10g of C4H10 in 200g of C6H6 freeze is __________ \(^\circ\)C. (The molal freezing point depression constant of C6H6 is 5.12\(^\circ\)C/m.)

Which one of the following 0.06 M aqueous solutions has lowest freezing point?

At 20\(^\circ\) C, the vapour pressure of benzene is 70 torr and that of methyl benzene is 20 torr. The mole fraction of benzene in the vapour phase at 20\(^\circ\) above an equimolar mixture of benzene and methyl benzene is _____________ $...

The vapour pressures of A and B at 25\(^\circ\)C are 90 mm Hg and 15 mm Hg respectively. If A and B are mixed such that the mole fraction of A in the mixture is 0.6, then the mole fraction of B in the vapour phase is x \(\times\) 10\(-\)1. ...

2 molal solution of a weak acid HA has a freezing point of 3.885\(^\circ\)C. The degree of dissociation of this acid is ___________ \(\times\) 10\(-\)3. (Round off to the Nearest Integer).[Given : Molal depression constant of water = 1.85 K...

A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52\(^\circ\)C. The percentage association of A is __________. (Round off to the Nearest Integer).[Use : Kb for water = 0.52 K kg mol\(-\)1 Boiling point of w...

The oxygen dissolved in water exerts a partial pressure of 20 kPa in the vapour above water. The molar solubility of oxygen in water is __________ \(\times\) 10\(-\)5 mol dm\(-\)3. (Round off to the Nearest Integer).[Given : Henry's law con...

A 1 molal K4Fe(CN)6 solution has a degree of dissociation of 0.4. Its boiling point is equal to that of another solution which contains 18.1 weight percent of a non electrolytic solute A. The molar mass of A is __________ u. (Round off to t...

AB2 is 10% dissociated in water to A2+ and B\(-\). The boiling point of a 10.0 molal aqueous solution of AB2 is __________\(^\circ\)C. (Round off to the Nearest Integer).[Given : Molal elevation constant of water Kb = 0.5 K kg mol\(-\)1 boi...

At 363 K, the vapour pressure of A is 21 kPa and that of B is 18 kPa. One mole of A and 2 moles of B are mixed. Assuming that this solution is ideal, the vapour pressure of the mixture is ___________ kPa. (Round off to the Nearest Integer).

How much amount of NaCl should be added
to 600 g of water (\(\rho\) = 1.00 g/mL) to decrease
the freezing point of water to – 0.2 °C ?
______.
(The freezing point depression constant for water = 2K kg mol–1)

A cylinder containing an ideal gas (0.1 mol of
1.0 dm3) is in thermal equilibrium with a large
volume of 0.5 molal aqueous solution of
ethylene glycol at its freezing point. If the
stoppers S1 and S2 (as shown in the figure) are
suddenly wi...

A graph of vapour pressure and temperature for three different liquids X, Y, and Z is shown below :

The following inferences are made :
(A) X has higher intermolecular interactions compared to Y.
(B) X has lower intermolecular interactions...

At 35oC, the vapour pressure of CS2
is 512 mm. Hg and that of acetone is 344 mm Hg. A solution
of CS2
in acetone has a total vapour pressure of 600 mm Hg. The false statement amongst the
following is :

Two open beakers one containing a solvent and the other containing a mixture of that solvent
with a non voltatile solute are together selated in a container. Over time :

The elevation of boiling point of 0.10 m
aqueous CrCl3.xNH3 solution is two times that
of 0.05 m aqueous CaCl2 solution. The value of
x is ______.
[Assume 100% ionisation of the complex and
CaCl2, coordination number of Cr as 6, and that
al...

A set of solutions is prepared using 180 g of
water as a solvent and 10 g of different nonvolatile solutes A, B and C. The relative
lowering of vapour pressure in the presence of
these solutes are in the order :[Given, molar
mass of A = 100...

At 300 K, the vapour pressure of a solution
containing 1 mole of n-hexane and 3 moles of
n-heptane is 550 mm of Hg. At the same
temperature, if one more mole of n-heptane is
added to this solution, the vapour pressure of
the solution increa...

The osmotic pressure of a solution of NaCl is
0.10 atm and that of a glucose solution is
0.20 atm. The osmotic pressure of a solution
formed by mixing 1 L of the sodium chloride
solution with 2 L of the glucose solution is
x \(\times\) 10...

Henry’s constant (in kbar) for four gases \(\alpha\), \(\beta\), \(\gamma\) and \(\delta\) in water at 298 K is given below :

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If 250 cm3
of an aqueous solution containing 0.73 g of a protein A is isotonic with one litre of
another aqueous solution containing 1.65 g of a protein B, at 298 K, the ratio of the molecular
masses of A and B is ______ × 10–2 (to the nea...

The size of a raw mango shrinks to a much
smaller size when kept in a concentrated salt
solution. Which one of the following processes
can explain this?

Which one of the following statements regarding Henry's law is not correct ?

A solution containing 62 g ethylene glycol in 250 g water is cooled to \(-\) 10oC. If Kf for water is 1.86 K kg mol\(-\)1 , the amount of water (in g) separated as ice is :

Liquid 'M' and liquid 'N' form an ideal solution.
The vapour pressures of pure liquids 'M' and
'N' are 450 and 700 mmHg, respectively, at the
same temperature. Then correct statement is:
(xM = Mole fraction of 'M' in solution ;
xN = Mole fr...

The osmotic pressure of a dilute solution of an
ionic compound XY in water is four times that
of a solution of 0.01 M BaCl2 in water.
Assuming complete dissociation of the given
ionic compounds in water, the concentration of
XY (in mol L–1)...

Molal depression constant for a solvent is
4.0 kg mol–1. The depression in the freezing
point of the solvent for 0.03 mol kg–1 solution
of K2SO4 is :
(Assume complete dissociation of the
electrolyte)

The vapour pressures of pure liquids A and B are 400 and 600 mmHg, respectively at 298 K on
mixing the two liquids, the sum of their initial volume is equal ot the volume of the final mixture.
The mole fraction of liquid B is 0.5 in the mix...

For the solution of the gases w, x, y and z in
water at 298K, the Henrys law constants (KH)
are 0.5, 2, 35 and 40 kbar, respectively. The
correct plot for the given data is :-