Questions

A solution of 0.816g of a compound ‘A’ dissolved in 7.5g of Benzene freezes at $1{.59}^{0}\mathrm{C}$ . The molecular weight of compound ‘A’ if ${\mathrm{K}}_{\mathrm{f}}$ of benzene is 4.9 and melting point of Benzene is $5{.51}^{0}\mathrm{C}$

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a

120

b

136

c

32

d

180

detailed solution

Correct option is B

It is a colligative property of solutions that is generally proportional to the molality of the added solute. The depression in the freezing point of a solution can be described by the following formula.

**ΔT _{f} = K_{f }× m**

Where

- ΔT
_{f}is the freezing point depression - K
_{f}is the cryoscopic constant, and - m is the molality.

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