Question

A block of ice at -8ºC is slowly heated and converted to steam at 100°C. Which of the following curves represents the phenomena qualitatively ?

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

When heat is supplied the temperature of ice increases form -$10{^\circ}C$ to 0 ${^\circ}C$ it is represented by a straight line inclined to heat axis. At $0{^\circ}$C the heat is used in converting ice into water at $0{^\circ}C$. The stage is represented by horizontal straight portion. After that temperature of water rises from $0º$C. to 100 ${^\circ}C.$ it is represented by a straight line inclined to heat axis. At $100{^\circ}C$, the heat is used in converting water into steam. The graph is represented by horizontal straight line. Thus options (1) is correct.