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# Solutions

#### Multiple Choice Questions

1.

A 1000C 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

• 1000C

• 1020C

• 1030C

• 1030C

3934 Views

2.

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 250C.
(Given, vapour pressure data at 250C benzene = 12.8 kPa, toluene = 3.85 kPa)

• The vapour will contain a higher percentage of toluene

• The vapour will contain equal amounts of benzene and toluene

• Not enough information is given to make a prediction

• Not enough information is given to make a prediction

2300 Views

3.

which is one not equal to zero for an ideal solution?

• ΔHmix
• ΔSmix
• ΔVmix
• ΔVmix
1230 Views

4.

A mixture of gases contains H2 and O2 gases in the ratio of 1:4 (w/w).what is the molar ratio of the two gases in the mixture?

• 1:4

• 4:1

• 16:1

• 16:1

2576 Views

5.

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

• X is undergoing dissociation in water

• The molecular mass of X  is greater than the molecular mass of Y.

• Molecular mass of X is less than the molecular mass of Y,

• Molecular mass of X is less than the molecular mass of Y,

1993 Views

6.

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

• K2SO4

• K3[Fe(CN)6]

• Al(NO3)3

• Al(NO3)3

1500 Views

7.

In Duma's method for estimation of nitrogen 0.25 g of an organic compound gave 40 ml of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm the percentage of nitrogen in the compounds is,

• 17.36

• 18.20

• 16.76

• 15.76

2154 Views

8.

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

• KCl

• C6H12O6

• Al2(SO4)3

• Al2(SO4)3

2104 Views

9.

The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be

• 5.4 g

• 10.8 g

• 54.0 g

• 54.0 g

4456 Views

10.

Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25oC are 200 mmHg and 41.5 mmHg 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)

• 173.9 mmHg

• 615.0 mmHg

• 347.9 mmHg

• 347.9 mmHg

1498 Views