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Assertion : When ice and water are kept ...

Assertion : When ice and water are kept in a perfectly insulated thermos flask at 273 K and the atmospheric pressure, there is no change in mass of ice and water.
Reason : The system is in static equilibrium.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
There is no change in mass of ice and water as rates of transfer of molecules from ice into water and reverse tranfer from water into ice are equal at atmospheric pressure and 273 K. The system is in dynamic equilibrium.
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Knowledge Check

  • During the melting of an ice slab at 273K at atmospheric pressure :

    A
    Positive work is doen on the ice`-` water system by the atmosphere.
    B
    Positive work is done by the ice`-` water system on the atmosphere
    C
    The internal energy of the ice`-` water system decreases
    D
    The internal energy of the ice`-` water system increases.

  • During the melting of a slab of ice at 273K at atmospheric pressure,

    A
    positive work is done by the ice-water system on the atmosphere.
    B
    positive work is done on the ice-water system by the atmosphere.
    C
    the internal energy of the ice-water system increases.
    D
    the internal energy of the ice-water system decreases.

  • In the above problem mass of ice and water in the mixture when thermal equlibrium is attained is

    A
    40 g ice, 180 g water
    B
    60 g ice, 160 g water
    C
    20 g ice, 200 g water
    D
    None of the above

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