Question

Assertion: At the melting point temperature, both the solid and liquid state of a substance coexist.
Reason: At the melting point temperature, the two states of a substance can be interchanged.

• A. Both assertion and reason are correct and reason is correct explanation for assertion.
• B. Both assertion and reason are correct but reason is not correct explanation for assertion.
• C. Assertion is correct but reason is incorrect.
• D. Assertion is incorrect but reason is correct.

Answer 1

The correct option is A

Both assertion and reason are correct and reason is correct explanation for assertion.

The explanation for Assertion statement

• The melting point is usually defined as the point at which materials change from a solid to a liquid.
• The temperature at which a solid changes its state to liquid at atmospheric pressure is called the melting point of that liquid.

The explanation for Reason statement

• This is the point at which both liquid and solid phase exists at equilibrium. Hence, at the melting point temperature, the two states of a substance can be interchanged.
• If the temperature rises then we will get a liquid state and if we decrease the temperature then a solid-state will appear.

Hence option A is correct.