Colligative Properties

Q.

Four solutions of ${\mathrm{K}}_2{\mathrm{SO}}_4$ with the following concentration $0.1\mathrm{m},0.01\mathrm{m},0.001\mathrm{m}$ and $0.0001\mathrm{m}$ are available. The maximum value of van t Hoff factor$\left(\mathrm{i}\right)$ corresponds to

1. $0.1\mathrm{m}$ Solution

2. $0.01\mathrm{m}$ Solution

3. $0.001\mathrm{m}$ Solution

4. $0.0001\mathrm{m}$ Solution

Q. what is meant by long range melting point?

Q. For the dissolution of gas in solvent at a given temperature, increase in pressure of gas will result in:

1. cannot be predicted
2. no change in solubility
3. Increase in solubility
4. decrease in solubility

Q. The boiling point of an aqueous urea solution is $101.04{}^{\circ }C$. The density of solution is 1.12 g/mL. Which of the following is/are correct statement(s) regarding this solution?
[Given: For water, $K_b=0.52{\text{K kg mol}}^{-1},K_f=1.86{\text{K kg mol}}^{-1}$]

1. The molarity of solution is 2 M
2. The freezing point of solution is $3.72{}^{\circ }C$
3. If the solution is cooled to $-1.86{}^{\circ }C$, no ice will form
4. At any temperature, the relative lowering of vapour pressure is $\left(\frac{9}{259}\right)$

Q. For the dissolution of gas in solvent at a given temperature, increase in pressure of gas will result in:

1. Increase in solubility
2. no change in solubility
3. decrease in solubility
4. cannot be predicted

Q.

Value of gas constant R is

[AIEEE 2002]

1. 0.082 litre atm

2. 0.987 cal mol^-1 K^-1

3. 8.3 J mol^-1 K^-1

4. 83 erg mol^-1 K^-1

Q. how to identify whether the process is fusion or vaporisation?

Q. Need conceptual explanation: Ionic crystals are thermally and optically anisotropic because these properties change with direction.