Which one of the following statements is correct when saturation pressure of water vapour increases?

Saturation temperature decreases

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Enthalpy of evaporation decreases

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Enthalpy of evaporation increases

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Specific volume change of liquid vapour phase increases

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Solution

The correct option is B Enthalpy of evaporation decreases
As saturation pressure increases, enthalpy of evaporation decreases.

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100^{0}

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The water boils when :

1.Saturated vapour pressure of water becomes equal to atmospheric pressure

2. Boiling point of water becomes more than atmospheric pressure

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4. Vapour pressure of water becomes more than atmospheric pressure

100^{0} C

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