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Q.

Select the correct statement

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a

On heating continuously a substance changes from solid to gas via liquid phase only

b

Change of phase occurs at variable temperature

c

Water can exist in all 3 phases

d

Boiling point increases with increase in pressure

answer is C.

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Detailed Solution

Water can exist in all 3 phases that are in thermal equilibrium with each other. It is referred to as the triple point of water. When a substance is heated it may change directly from solid to gas. This is called sublimation. Boiling point increases with decrease in pressure. Change of phase occurs at constant pressure.
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