1. Given below are two statements, in which one is labelled as Assertion (A) and the other as Reason (R):
Assertion (A): The boiling point of water decreases as the altitude increases.
Reason (R): The atmospheric pressure increases with altitude.
Select the correct answer using the code give below:
(a) (A) is true but (R) is false
(b) (A) is false but (R) is true.
(c) Both (A) and (R) are true and (R) is correct explanation of (A),
(d) Both (A) and (R) are true but (R) is not correct explanation of (A)
Answer: a
When the vapour pressure becomes equal to the atmospheric pressure, the liquid starts boiling. Now, at the higher altitude level the atmospheric pressure is lower, so the vapour pressure of the liquid also needs to be lower to reach boiling point.
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