Consider the following statements with reference to the phase changes:
1. When a liquid freezes, it releases thermal energy into its immediate environment.
2. When a solid melts, it releases thermal energy into its immediate environment.
3. When a solid melts, its temperature increases
Which among the above is / are correct statements?

Answer: [A] Only 1

The first statement is correct. When a liquid freezes, it releases thermal energy into its immediate environment.

But the second statement is incorrect, because a solid must absorb thermal energy in order to melt.

Third statement is also incorrect because while a substance undergoes a phase change, its temperature remains constant. This implies that as a solid melts or as a liquid freezes, its temperature remains constant.

This question is a part of GKToday's Integrated IAS General Studies Module