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Assertion : Molar heat of vaporistion of...

Assertion : Molar heat of vaporistion of water is greater then benzene
Reason : Molar heat of vaporisation is the amount of heat required to vaporised 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 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 false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
B
We know that heat of vaporisation of water at`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 vaporisation,Therefore ,both assertionand reason are true but reason is not the correct explanation of assertion.
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Knowledge Check

  • 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 false but reason is true.

  • The latent heat of vaporisation of water is :

    A
    `2.25 xx 10^(6) J//kg`
    B
    `3.34 xx 10^(6) J//kg`
    C
    `22.5 xx 10^(4) J//kg`
    D
    `33.4 xx 10^(5) J//kg`

  • The laten heat of vaporisation of liquid is is

    A
    `3.33 xx 10^(5) J KG^(-1)`
    B
    `22.6 xx 10^(5) j Kg^(-1)`
    C
    `2.26 xx 10^(5) J kg^(-1)`
    D
    None of these