Question

Assertion (A):The temperature at which vapour pressure of a liquid equal to the external pressure is called boiling temperature.
Reason (R): At high altitude atmospheric pressure is high.

• A. Both A and R are true and R is the correct explanation of A.
• B. Both A and R are true but R is not the correct explanation of A.
• C. A is true but R is false.
• D. A is false but R is true.

Answer 1

The correct option is C A is true but R is false.

The temperature at which the vapour pressure of a liquid becomes equal to the external pressure or atmospheric pressure is called its boiling point. Atmospheric pressure decreases with increase in altitude, so atmospheric pressure is low at altitude.
Thus, assertion is true and reason is false.