Ncert Exercises & Solutions

Given below are two statements:

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

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: At high altitudes amount of oxygen is low

The temperature at which the vapor pressure of a liquid is equal to the external pressure is called boiling temperature.

At high altitudes, atmospheric pressure is low because the level of oxygen decreases at high altitudes.

Hence, the Assertion is true but the reason is false.