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Standard VIII

Chemistry

Interconversion of States of Matter

If we heat wa...

Question

If we heat water then it converts to water vapour and this phase transition is called ___ .

Solidification

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Vaporisation

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Sublimation

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Diffusion

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Solution

The correct option is B
Vaporisation

The phase transition of water to water vapour on heating or raising the temperature is called vaporisation.

When we heat water the kinetic energy of the particles increases and they are able to overcome the force of attraction between each other and get converted into vapour.

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Similar questions

Q. The conversion of a solid into vapours without passing through the liquid state is called :
(a) vaporisation
(b) fusion
(c) sublimation
(d) freezing

Q. Vaporisation is a phase transition of :

Q. When

1 g m

of water changes from liquid to vapour phase at constant pressure of

1

atmosphere, the volume increases from

1 c c

1671 c c

. The heat of vaporisation at this pressure is

540 c a l / g m

. Increase in internal energy of water is

(1 a t m o s p h e r e = 1.01 \times 10^{6} d y n e / c m^{2})

Suppose we take some water in a container and seal it. Now we place it on a heater, the water starts boiling and converts into vapour. Now if we allow the container to cool down for some time and then open seal. The amount of water we get:

1

mole of ice at

0^{o} C

and

4.6 m m

H g

pressure is converted to water vapour at a constant temperature and pressure. Find

Δ H

and

Δ E

if the latent heat of fusion of ice is

80

Cal/gm and latent heat of vaporisation of liquid water at

0^{o} C

596

Cal per gram and the volume of ice in comparison to that of water vapour is neglected.

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