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Question

A 5% solution of cane sugar (molecular weight =342) is isotonic with 1% solution of substance X. The molecular weight of X is:


A
171.2
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B
68.4
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C
34.2
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D
136.2
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Solution

The correct option is B 68.4
For non-electrolytic solutions,if isotonic,
$${C}_{1}={C}_{2}$$
    $$=\displaystyle\frac{5\times 1000}{342\times 100}=\frac{1\times 1000}{M{w}_{2}\times 100}$$
$$\therefore M{w}_{2}=68.4$$

Chemistry

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