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Q.

When 3 g of a nonvolatile solute is dissolved in 50 g of water, the relative lowering of vapour pressure observed is 0.018 Nm−2. Molecular weight of the substance is

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a

60

b

30

c

40

d

120

answer is A.

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Detailed Solution

PAo−pPAo=XBBy putting values, 0.018 =wBMBwAMA+wBMB⇒0.018=3MB3MB+50180.006MB=18MB54+50MB=58.92By calculating MB=60
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