Question

A block of ice at - ${10}^{\circ }C$ is slowly heated and converted to steam at ${100}^{\circ }C$. Which of the following curves represent the phenomenon qualitatively?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

The change of ice at $-{10}^{\circ }C$ into steam at ${100}^{\circ }C$ occurs in four stages.

1. The temperature of ice changes from $-{10}^{\circ }Cto{0}^{\circ }C$.
2. Ice at $0^{\circ }C$ changes to water at $0^{\circ }C$. The state changes as heat is supplied.
3. Water at $0^{\circ }C$ changes into water at ${100}^{\circ }C$.
4. Water at ${100}^{\circ }C$ change into steam at ${100}^{\circ }C$. The state changes as heat is supplied.