Q. A $5 \%$ solution of cane sugar (molar mass $=342$ ) is isotonic with $1 \%$ solution of a substance $X$. The molar mass of $X$ is

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A

$171.2$

B

$68.4$

C

$34.2$

D

$136.2$

Solution:

Or, $MX =\frac{1}{5} X 342=68.4$

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