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Q.

An aqueous solution is 1. 00 molal in KI. Which change will cause the 

vapour pressure of the solution to increase.

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a

Addition of NaCl 

b

Addition of 1.00 molal KI

c

Addition of water

d

Addition  of  Na2SO4

answer is A.

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Detailed Solution

According to raoults law

Ps=PXAXA= mole fraction of solvent) 

and on addition of water the mole fraction of water in the solution

 increases therefore vapour pressure increases. 

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