Which of the liquids in each of the following pairs has a higher vapour pressure?

Alcohol, glycerine

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Mercury, water

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petrol, kerosene

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None of these

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Solution

The correct option is D Alcohol, glycerine
Alcohol and glycerine have high vapour pressure because they have high intermolecular attraction.
As the intermolecular attraction increases vapour pressure increases.

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Liquid a has higher vapour pressure than liquid b. Which liquid out of a and b will have lower boiling point.

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B

145^{o} C

190^{o} C

80^{o} C

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