NEET 2010 Chemistry question

An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

(1)Addition of NaCl
(2)Addition of
(3)Addition of 1.00 molal KI
(4)Addition of waterCorrect

Answer: (4)

Solution

The vapour pressure of a solution is lowered by non-volatile solute (Raoult's law: ). Adding NaCl (1) or (2) increases the solute particle concentration, so the mole fraction of water decreases and the vapour pressure

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Question ID VK-090524