PHYSICS

JAMB 2020 - Question 16

Physics 2020 JAMB Past Questions - Question 16: I.A liquid boils when its saturated vapour pressure is equal to the external pressure II Dissolved substances in pure water lead to increase in the boiling point. III When the external pressure is increased, the boiling point increases IV Dissolved substances in pure water decrease the boiling point which combination of the above are peculiarities of the boiling point of a liquid ?

Choose the correct answers from the options given.
I.A liquid boils when its saturated vapour pressure is equal to the external pressure II Dissolved substances in pure water lead to increase in the boiling point. III When the external pressure is increased, the boiling point increases IV Dissolved substances in pure water decrease the boiling point which combination of the above are peculiarities of the boiling point of a liquid ?
A:
B:
C:
D:
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Correct Answer

C

Explanation

The peculiarities of the boiling point of a liquid are described by statements I and IV. When a liquid's saturated vapor pressure is equal to the external pressure, it boils (statement I). Additionally, dissolved substances in pure water decrease the boiling point (statement IV). These two statements together capture the peculiarities of the boiling point of a liquid.