Q.

If po and ps are vapour pressures of the solvent and solution respectively, n1 and n2 are the mole fractions of solvent and solute respectively, then

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a

ps=pon1

b

ps=pon2

c

po=psn2

d

ps=pon1n2

answer is A.

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Detailed Solution

From Raoult's law,                   po-Pspo=n2     ⇒1-pspo=n2 pspo=1-n2=n1 ps=n1×po
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If po and ps are vapour pressures of the solvent and solution respectively, n1 and n2 are the mole fractions of solvent and solute respectively, then