Question

The boiling point of water is low at high altitudes Explain.
A) As atmospheric pressure is high.
B) Temperature is high
C) As atmospheric pressure is low.
D) None of these

Answer 1

Hint: At higher altitudes, less energy means less heat is needed to boil water, thus it is easy to get this question solved. Boiling of water requires the presence of heat. The bonds of water molecules break themselves once the energy is transferred to it.

Complete answer:
We can explain this question as follows; at higher altitudes, atmospheric pressure is low therefore, less energy is required to bring the water to boiling point.
Boiling of water requires the presence of heat. The bonds of water molecules break themselves once the energy is transferred to it. This leads to the changing in the phase from liquid to vapor phase due to which internal vapor pressure turns equal to atmospheric pressure and thus the water starts to boil forming bubbles.
Therefore, when atmospheric pressure is lower during high altitudes, it takes less energy to bring the water to boiling point. Less energy means less heat is required to boil the water at lower temperature in higher altitudes.
Option A) this is an incorrect option as atmospheric pressure is not high while boiling water at higher altitudes.
Option B) This is an incorrect option as less heat is required while boiling water at higher altitudes as less heat means less energy.
Option C) this is a correct option as at higher altitudes the boiling point of water is low as the atmospheric pressure is low as explained above.
Option D) this is an incorrect option

So, Option C is correct.

Note:
We have to remember when while boiling the water, water molecules break themselves and the phase is changed. As we know that from liquid state the phase is changed to vapor state.