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Q.

Relative lowering of vapour pressure of non aqueous solution containg non volatile solute is 0.1. Molality of the solution will be ------(MW of solvent=50)

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a

2 m

b

2.22 m

c

1.9 m

d

1.99 m

answer is B.

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Detailed Solution

RLVP =Xsolute;  Xsoluten2=0.1; Xsolvntn1=0.9; Molality(m) =nsolute×1000Wsolvent; Molality(m) =0.1×10000.950; Molality(m) =2.22 m ;
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