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 represents the phenomenon qualitatively?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Initially, on heating, temperature rises from $-{10}^{\circ }C$ to $0^{\circ }C$. Then, the ice melts during which time the temperature does not rise. After the whole ice has melted, temperature begins to rise again, until it reaches ${100}^{\circ }C$. Then it becomes constant at the boiling point when the water is converted to steam.

Hence, graph in option (a) represents this phenomenon.