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