The correct option is B 68.4For non electrolytic solutions,if isotonic, C_1=C_2 nbsp; nbsp; =5× 1000/342× 100=1× 1000/Mw_2× 100 ∴ Mw_2=68.4 ...

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Osmotic Pressure

A 5

Question

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

171.2

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68.4

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34.2

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136.2

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Solution

The correct option is B 68.4
For non-electrolytic solutions,if isotonic,
$C_{1} = C_{2}$
$= \frac{5 \times 1000}{342 \times 100} = \frac{1 \times 1000}{M w_{2} \times 100}$
$∴ M w_{2} = 68.4$

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