Solutions

Consider the given plots of vapour pressure (VP) vs temperature (T/K). Which amongst the following options is correct graphical representation showing Tf, depression in the freezing point of a solvent in a solution?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

CrCl3 xNH3 can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of 0.558 C. Assuming 100% ionisation of this complex and coordination number of Cr is 6, the complex will be (Given Kf = 1.86 K kg mol-1)

1. [Cr(NH3)5Cl]Cl2
2. [Cr(NH3)4Cl2]Cl
3. [Cr(NH3)6]Cl3
4. [Cr(NH3)3Cl3]

When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm of Hg. The mole fraction of the solute in the solution is 0.2. What would be the mole fraction of the solvent if decrease in vapour pressure is 20 mm of Hg ?

1. 0.2
2. 0.4
3. 0.8
4. 0.6

Consider a binary solution of two volatile liquid components 1 and 2. x1 and y1 are the mole fractions of component 1 in liquid and vapour phase, respectively. The slope and intercept of the linear plot of 1x1 vs 1y1 are given respectively as :

1. P10P20, P10-P20P20
2. P20P10, P20-P10P10
3. P20P10, P10-P20P20
4. P10P20, P20-P10P20

Arrange the following solutions in order of their increasing boiling points. (i) 10-4 M NaCl (ii) 10-4 M Urea (iii) 10-3 M NaCl (iv) 10-2 M NaCl

1. (i) < (ii) < (iii) < (iv)
2. (ii) < (i) < (iii) < (iv)
3. (iv) < (iii) < (i) < (ii)
4. (ii) < (i) (iii) < (iv)

Density of 3 M NaCl solution is 1.25 g/mL. The molality of the solution is :

1. 2.79 m
2. 2 m
3. 1.79 m
4. 3 m

0.05 M CuSO4 when treated with 0.01 M K2Cr2O7 gives green colour solution of Cu2Cr2O7. The two solutions are separated as shown below : [SPM : Semi Permeable Membrane] [figure] Due to osmosis :

1. Molarity of K2Cr2O7 solution is lowered.
2. Green colour formation observed on side Y.
3. Molarity of CuSO4 solution is lowered.
4. Green colour formation observed on side X.

We have three aqueous solutions of NaCl labelled as 'A', 'B' and 'C' with concentration 0.1 M, 0.01 M and 0.001 M, respectively. The value of van 't Hoff factor (i) for these solutions will be in the order :

1. iA < iC < iB
2. iA < iB < iC
3. iA > iB > iC
4. iA = iB = iC

Identify the mixture that shows positive deviations from Raoult's Law

1. (CH3)2CO + CS2
2. (CH3)2CO + C6H5NH2
3. CHCl3 + C6H6
4. CHCl3 + (CH3)2CO

What happens to freezing point of benzene when small quantity of naphthalene is added to benzene?

1. Increases
2. Decreases
3. Remains unchanged
4. First decreases and then increases

The solution from the following with highest depression in freezing point/lowest freezing point is

1. 180 g of acetic acid dissolved in benzene
2. 180 g of acetic acid dissolved in water
3. 180 g of benzoic acid dissolved in benzene
4. 180 g of glucose dissolved in water

If a substance 'A' dissolves in solution of a mixture of 'B' and 'C' with their respective number of moles as nA, nB and nC. Mole fraction of C in the solution is

1. nCnA nB nC
2. nBnA+nB
3. nCnA+nB+nC
4. nCnA-nB-nC

A solution of two miscible liquids showing negative deviation from Raoult's law will have :

1. increased vapour pressure, increased boiling point
2. increased vapour pressure, decreased boiling point
3. decreased vapour pressure, decreased boiling point
4. decreased vapour pressure, increased boiling point

The quantity which changes with temperature is :

1. Molality
2. Molarity
3. Mole fraction
4. Mass percentage