Test: Vapour Liquid Equilibria
10 Questions MCQ Test Mass Transfer | Test: Vapour Liquid Equilibria
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A new phase is given for the separation by distillation.
Explanation: Here, the separation is done by vaporization.
Consider a sugar solution[ Sugar + Water]; On vaporization water only evaporate since sugar is________
Explanation: There is no boiling point for the Non-volatile compound. So the sugar has no vapour pressure.
Distillation is possible only if the solution components are_____________
Explanation: Since the distillation is done by vaporization the components should be volatile for separation.
Explanation: Distillation is the only process gives the pure component separation.
In a solution (A and B); The vapour pressure of A is 260 mmHg and B is 360 mmHg; Find the relative volatility?
Explanation: Relative volatility= vapour pressure of A/ Vapour pressure of B
= 260/360
=0.72.
If the gas phase composition of a component A is 0.65 and its relative volatility is 2. Find the liquid phase composition.
Explanation: Relative volatility= 0.65/(1-0.65) * (1-x)/x
2= 1.85 * (1-x)/x ; x= 0.48.
The component A and B has the same boiling point. Can the separation is done by ordinary separation?
Explanation: Separation cannot be done if the two components have the same vapour pressure.
The possibility of separation will be more if the separation factor is greater than 1.
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.
Find the vapour pressure of a component A in an ideal mixture, if its liquid composition and the partial pressure is 0.65 and 260 mmHg.
Explanation: For an ideal solution, Partial pressure = vapour pressure x mole fraction
Vapour pressure= (260/0.65)=400 mmHg.
Consider an ideal vapour-liquid binary mixture, find the total pressure if the vapour pressure of A is 260 mmHg and the vapour pressure of B is 520 mmHg and the composition of A in mole fraction is 0.55.
Explanation: Total pressure = (vapour pressure of A * mole fraction) + vapour pressure of B*( 1- mole fraction) = 377 mmHg.
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