Q.

Equal weight of a solute are dissolved in equal weight of two solvents A and B and formed very dilute solution. The relative lowering of vapour pressure for the solution B has twice the relative lowering of vapour pressure for the solution A. lf MA and MB are the molecular weights of solvents A and B respectively, then:

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a

MA=MB

b

MB=2×MA

c

MA=4MB

d

MA=2MB

answer is B.

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Detailed Solution

p∘−Pp∘=nn+N≈nN(for very dilute solution )2×nNA=nNBMB=2MA
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Equal weight of a solute are dissolved in equal weight of two solvents A and B and formed very dilute solution. The relative lowering of vapour pressure for the solution B has twice the relative lowering of vapour pressure for the solution A. lf MA and MB are the molecular weights of solvents A and B respectively, then: