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Q.

A volatile solute AB is dissolved in water, in which mole fraction of water is 5/6. If 50% of molecules of AB get dissociated into A and B and remaining 50% get dimerised into (AB)2. Then relative lowering of vapour pressure will

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a

Increase by 20%

b

Remain same because mass of solute is unchanged

c

Increase by 25%

d

Remain same because no.of solute particles will not change

answer is B.

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Detailed Solution

Question Image

i=0.5+0.5+0.52=1.25

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