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Y g of non - volatile organic substance of molecular mass M is dissolved in 250 g benzene. Molal elevation constant of benzene is $K_b$. Elevation in its boiling point is given by

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$\Delta T=\large\frac{1000\times K_b\times Y}{250\times M}$
$\Rightarrow \large\frac{4K_bY}{M}$
Hence (B) is the correct answer.
answered Jun 11, 2014 by sreemathi.v

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