The molecular weight of $N a C l$ determined by osmotic pressure method will be :

same as theoritical value

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higher than theoritical value

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lower than theoritical value

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negative

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Solution

The correct option is C lower than theoritical value
We know that, vant hoff factor for $N a C l$ is 2.
Also,
$i = \frac{n o r m a l m o l a r m a s s}{a b n o r m a l m o l a r m a s s}$ Therefore experimental molar mass is less.

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