Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to – McqOptions

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1.	Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 gof Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?
A.	20
B.	50
C.	100
D.	200
Answer» C. 100

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