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Q. Assertion : At high altitudes, liquids boil at lower temperatures in comparison to that at sea level.
Reason : At high altitudes, atmospheric pressure is low.

States of Matter

Solution:

At higher altitudes, the atmospheric pressure is decreased. Due to a decrease in the external pressure, the boiling point also decreases in comparision with that of sea level. $\Rightarrow $ At high altitudes liquids boil at a lower temperature.