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Relative Lowering of Vapour Pressure

Little HgI2...

Question

Little $H g I_{2}$ is added to 1.0 molal KI solution. Which of the will be noticed?

A

vapour pressure increases

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B

boiling point decreases

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C

freezing point decreases

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D

pressure decreases

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Solution

The correct options are
A boiling point decreases
B vapour pressure increases
D pressure decreases
When little $H g I_{2}$ is added to 1.0 molal $K I$ solution, it forms a complex leading to increase in vapour pressure.Boiling point and osmotic pressure also decrease as value of van't hoff factor is less than 1.

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