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Question

Which of the following statements regarding a liquid is not correct?


A
The vapour pressure of a liquid increases with increase in temperature.
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B
The vapour pressure of a liquid decreases in the presence of a non-volatile impurity.
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C
The vapour pressure increases with decrease in temperature.
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D
At the normal boiling point, the vapour pressure of a liquid is 1 atm.
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Solution

The correct option is C The vapour pressure increases with decrease in temperature.
When a liquid is heated, it starts evaporating. So, more pressure is exerted because more molecules converts to vapour state.

 So, the vapour pressure increases with the increase in temperature.

Option C is correct.

Chemistry

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