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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,
C1=C2
=5×1000342×100=1×1000Mw2×100
Mw2=68.4

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