Question

A graph of temperature vs time is shown for a substance being constantly heated from $T_1$ to $T_2$. Which parts of the graph show the substance existing in two states of matter?​

• A. OA and BC​
• B. OA and CD​
• C. AB and CD
• D. CD and DE

Answer 1

The correct option is C AB and CD

During the phase change process the substance is present in two states. In the following graph AB and CD shows addition of heat but no temperature is rising i.e the condition for latent heat. Hence AB and CD is phase change process where substance will exist in two states.​