1.00 g of 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 mol-1 kg K, the freezing point of benzene will be lowered by:
1. 0.4 K
2. 0.3 K
3. 0.5 K
4. 0.2 K
A solution that has the highest boiling point among the following is:
1. 1.0 M NaOH
2. 1.0 M Na2SO4
3. 1.0 M NH4NO3
4. 1.0 M KNO3
A solution containing 3.3 g of a substance in 125 g of benzene (b.p. 80 °C) boils at 80.66 °C. If Kb for one litre of benzene is 3.28 °C m-1, the molecular weight of the substance shall be -
1. 127.20 g mol-1
2. 131.20 g mol-1
3. 137.12 g mol-1
4. 142.72 g mol-1
The unit of Ebullioscopic constant is:
1. K kg mol–1 or K (molality)–1
2. mol kg K–1 or K–1 (molality)
3. kg mol–1 K–1 or K–1 (molality)–1
4. K mol kg–1 or K (molality)
The correct graph amongst the following, that represents the elevation in boiling point is:
1. | |
2. | |
3. | |
4. | None of the above. |
The boiling point of 0.2 mol kg–1 solution of X in water is greater than the equimolal solution of Y in water. The correct statement in this case is:
1. | X is undergoing dissociation in water. |
2. | Molecular mass of X is greater than the molecular mass of Y. |
3. | Molecular mass of X is less than the molecular mass of Y. |
4. | Y is undergoing dissociation in water while X undergoes no change. |
Aluminium phosphate is 100 % ionized in 0.01 m aqueous solution. Hence, is-
1. | 0.01 m | 2. | 0.015 m |
3. | 0.0175 m | 4. | 0.02 m |
The lowest boiling point, if concentration is fixed at 0.1 M in aqueous solution, is given by which of the following solutions?
a. K2SO4
b. NaCl
c. Urea
d. Glucose
1. a, b
2. b, c
3. c, d
4. d, a
The latent heat of vaporization of water is 540 cal g-1 at 100 oC. Kb for water is:
1.
2.
3.
4.