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  • Elevation in boiling point for 1.5 molal solution of glucose in water is 4 K. The depression in freezing point for 4.5 molal solution of glucose in water is 4 K. The ratio of molal elevation c

Elevation in boiling point for 1.5 molal solution of glucose in water is 4 K. The depression in freezing point for 4.5 molal solution of glucose in water is 4 K. The ratio of molal elevation constant to molal depression constant mathrm{left(K_{b} / K_{f} ight)} is __________.

Option: 1

3


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

As we have learnt,

\mathrm{\Delta T_{b}= K_{b}\: m}

\mathrm{\Delta T_{f}= K_{f}\: m}

\mathrm{\frac{\Delta T_ b}{\Delta T_{f}}=\frac{K_ b m}{K _f m} \Rightarrow \frac{4}{4}=\frac{K_{b}\times 1.5}{K_{f}\times 4.5} }

\mathrm{\frac{K_{b}}{K_{f}}=3}

Hence the answer is 3

Posted by

Gautam harsolia

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