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(Kf=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:
1. | 180 | 2. | 18 |
3. | 1.8 | 4. | 360 |
The total vapour pressure of a mixture of 1mol and 2 mol 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
One litre aqueous solution of sucrose (molar mass = 342 g/mol) weighing 1015 g is found to record an osmotic pressure of 4.82 atm at 293K. What is the molality of the sucrose solution? (R= 0.0821 L atm K-1 mol-1) :
(1) 0.84
(2) 0.21
(3) 0.42
(4) 0.63
The Van't Haff factor of a 0.005 M aqueous solution of KCl is 1.95. The degree of ionisation of KCl is:
(1) 0.95
(2) 0.97
(3) 0.94
(4) 0.96