A pair of  isotonic solutions, among the following, is (assuming temperature to be the same) :

1. 0.1 (M) urea and 0.1 (M) NaCl

2. 0.1 (M) urea and 0.2 (M) MgCl₂

3. 0.1 (M) NaCl and 0.1 (M) Na₂SO₄

4. 0.1 (M) Ca(NO₃)₂ and 0.1 (M) Na₂SO₄

A solution having osmotic pressure nearer to that of an equimolar solution of K₄[Fe(CN)₆] is-

1. Na₂SO₄

2. BaCl₂

3. Al₂(SO₄)₃

4. C₁₂H₂₂O₁₁ 

A two phase system consisting of a liquid dispersed in another liquid is known as-

(A) Foam 

(B) Suspension

(C) Emulsion

(D) Mist

The partial pressure of ethane over a saturated solution containing 3.56 X 10^-2 g of ethane is 3 bar. If the solution contains 9.00 X 10^-2 g of ethane, then what will be the partial pressure of the gas?

1. 0.76 bar

2. 0.16 bar

3. 7.82 bar

4. 3.12 bar

An aqueous solution of hydrochloric acid -

1. Obeys Raoult's law

2. Shows negative deviations from Raoult's law

3. Shows positive deviations from Raoult's law

4. Obeys Henry's law at all compositions

Osmotic pressure of equimolar solution of BaCl₂, NaCl and glucose will be in the order -

(1) BaCl₂ > NaCl > glucose

(2) glucose > NaCI > BaCl₂

(3) NaCl > BaCl₂ >glucose

(4) NaCl> glucose > BaCl₂

The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol individually. The mixture shows:

1. No deviation from Raoult's law

2. Positive deviation from Raoult's law

3. Negative deviation from Raoult's law

4. That the solution is unsaturated

20 g of naphthoic acid(C₁₁H₈O₂) dissolved in 50 g of benzene(K_f=1.72 K Kg mol^-1) shows a depression in freezing point of 2 K. The vant Hoff factor is ?

(1) 0.5

(2) 0.1

(3) 2

(4) 3

The relative lowering of vapour pressure caused by dissolving 71.3g of a substance in 1000g of water is 7.13 X 10^-3. The molecular mass of the substance is:

The total vapour pressure of a mixture of 1mol $\mathrm{A}\left({\mathrm{P}}_{\mathrm{A}}^0=150 \mathrm{torr}\right)$ and 2 mol $\mathrm{B}\left({\mathrm{P}}_{\mathrm{B}}^0=240 \mathrm{torr}\right)$ is 200 torr. In this case:

(1) There is a positive deviation from Raoult's law

(2) There is a negative deviation from Raoult's law

(3) There is no deviation from Raoult's law

(4) None of the above