1. Find the improper characteristic of ideal solution.
a) The average intermolecular force of attraction and repulsion are unchanged on mixing
b) Volume varies linearly with compositions
c) No evolution of heat
d) The total partial pressure varies linearly with compositions
Explanation: Because the vapour pressure only varies linearly with compositions.
2. A new phase is given for the separation by distillation.
a) true
b) false
Explanation: Here, the separation is done by vaporization.
3. Consider a sugar solution[ Sugar + Water]; On vaporization water only evaporate since sugar is________
a) Volatile
b) Non-Volatile
c) Cryogenic
d) None of the mentioned
Explanation: There is no boiling point for the Non-volatile compound. So the sugar has no vapour pressure.
4. Distillation is possible only if the solution components are_____________
a) Volatile
b) Non-volatile
c) Cryogenic
d) None of the mentioned
Explanation: Since the distillation is done by vaporization the components should be volatile for separation.
5. No further process required for _____________
a) Absorption
b) Extraction
c) Distillation
d) All of the mentioned
Explanation: Distillation is the only process gives the pure component separation.
6. In a solution (A and B); The vapour pressure of A is 260 mmHg and B is 360 mmHg; Find the relative volatility?
a) 0.72
b) 1.38
c) 2
d) None of the mentioned
Explanation: Relative volatility= vapour pressure of A/ Vapour pressure of B
= 260/360
=0.72.
7. If the gas phase composition of a component A is 0.65 and its relative volatility is 2. Find the liquid phase composition.
a) 0.48
b) 0.58
c) 0.68
d) 0.78
Explanation: Relative volatility= 0.65/(1-0.65) * (1-x)/x
2= 1.85 * (1-x)/x ; x= 0.48.
8. The component A and B has the same boiling point. Can the separation is done by ordinary separation?
a) true
b) false
Explanation: Separation cannot be done if the two components have the same vapour pressure.
9. The possibility of separation will be more if the separation factor is greater than 1.
a) true
b) false
Explanation: Since if relative volatility is equals to 1. The separation is not possible since the boiling point of the two components will be same.
10. Find the vapour pressure of component A in an ideal mixture, if its liquid composition and the partial pressure is 0.65 and 260 mmHg.
a) 260 mmHg
b) 400 mmHg
c) 760 mmHg
d) Cannot determine
Explanation: For an ideal solution, Partial pressure = vapour pressure x mole fraction
Vapour pressure= (260/0.65)=400 mmHg.