Question

Assertion :Molar heat of vaporisation of water is greater than benzene.
Reason:Molar heat of vaporisation is the amount of heat required to vaporise one mole of liquid at constant temperature.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both the assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If assertion is reason both are false.

Answer 1

Correct Answer - B
We know that heat of vaporisation of water is `100^(@)C`is `40.6kJ`and that of benzene is `31kJ`at `80^(@)C`. The amount of heat required to vaporise one mole of liquid at constant temperature is known as heat of vapourisation therefore both assertion and reason are true but reason is not the correct explanation of assertion.