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A 5% (w/V ) solution of cane sugar (mole...

A 5% (w/V ) solution of cane sugar (molecular mass = 342) is isotonic with 1% (w/V) solution of a subtance X. The molecular mass of X is :

A

136.2

B

68.4

C

34.2

D

171.2

Text Solution

Verified by Experts

The correct Answer is:
B
In isotonic solution the molar concentration is equal.
`therefore (5)/(342) =(1)/(M)` or `M =(342)/(5)=68.4 g mol^(-1)`
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