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By dissolving 5 g substance in 50 g of w...

By dissolving 5 g substance in 50 g of water, the decrease in freezing point is `1.2^(@)C` . The gram molal depression is `1.85^(@)C` . The molecular weight of substance is

A

`105.4`

B

`118.2`

C

`137.2`

D

`154.2`

Text Solution

Verified by Experts

The correct Answer is:
D
We know that
`m=(1000K_(f)xxW_(B))/(DeltaT_(f)xxW_(A))`
`:.m=(1000xx1.85xx5)/(1.2xx50)=154.2`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-SOLUTIONS AND COLLIGATIVE PROPERTIES -Exercise 2 (Miscellaneous Problems)
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  18. The mass of a non-volatile solute of molar mass 40g" "mol^(-1) that sh...

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