Question

The melting point of the solid state of a substance is ${40}^{\circ }C$. The freezing point of the liquid state of the same substance will be:

• A. ${35}^{\circ }C$
• B. ${40}^{\circ }C$
• C. ${45}^{\circ }C$
• D. It depends upon nature of the substance.

Answer 1

The correct option is B

${40}^{\circ }C$

The temperature at which a substance changes its state from liquid to solid at atmospheric pressure is called its freezing point. The temperature at which a substance changes its state from solid to liquid at atmospheric pressure is called its melting point. The numerical value of freezing point and melting point is the same.