Question

Ice at temperature –10°C is converted to steam at 100°C, the curve plotted between temperature (T) and time (t) when it is being heated by constant power source is

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is B

The heating process comprises distinct phases:

Phase 1: Heating Ice (-10°C to 0°C): Temperature rises to 0°C.

Phase 2: Melting Ice (0°C): Temperature plateaus at 0°C as ice transforms into water.

Phase 3: Heating Water (0°C to 100°C): Water temperature increases to 100°C.

Phase 4: Boiling Water (100°C): Temperature remains constant at 100°C as water becomes steam.

Phase 5: Heating Steam (Above 100°C): Steam temperature rises.

The corresponding graph will exhibit:

• Initial temperature rise from -10°C to 0°C.
• A horizontal segment at 0°C during ice melting.
• Subsequent temperature increase from 0°C to 100°C.
• A horizontal segment at 100°C during water boiling.
• Continued temperature increase for steam.