Select the correct statement

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

Correct Answer: Water can exist in all 3 phases

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.
Bissoy MCQ
#Class 11 Physics #Thermal Properties of Matter #Change of State

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