Question

The melting point of a substance is defined as the constant temperature at 1 atmospheric pressure at which _____________.

• A. The solid starts melting.
• B. both the solid and liquid exist together.
• C. only the liquid is present.
• D. the solid is completely changed into liquid.

Answer 1

Answer: (A), (B)

The correct options are
A The solid starts melting.
B both the solid and liquid exist together.

Melting point is the temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. The melting point of a solid is the temperature at which it changes state from solid to liquid at atmospheric pressure.