Question

A block of ice at – 10°C is slowly heated and converted to steam at 100°C. Which of the following curves represents the phenomenon qualitatively.

Answer 1

The correct option is (A).

Explanation:

Initially on heating temperature rises from – 10°C to 0°C. 

Then ice melts and temperature does not rise. 

After the whole ice has melted, temperature begins to rise until it reaches 100°C. Then it becomes constant as at boiling point, it will not rise.