Question

21. In the determination of boiling point of water, Correct reading in the thermometer
is noted when
a) Water starts boiling
b) Whole of the water evaporates.
c) Temperature starts rising
d) Temperature becomes constant.
u of N S solution in test tube the​

Answer 1

Answer:

a) water starts boiling

Answer 2

The correct reading in the thermometer is noted when  (D) Temperature becomes constant.

Step by step explanation:

Boiling point is the temperature at which the pressure near the environment of system and the vapour pressure of the materials become equal.

In determination of boiling point of water, we put thermometer in the water and increase the temperature.

Temperature increases upto a level at which the vapour pressure matches the pressure near the system that is the boiling temperature.

When the boiling point is achieved, the temperature do not change ( become constant) till all the water gets vapourized .

$\textbf{\Large So the correct reading in the thermometer is noted when}\\\\\textbf{\Large (D) Temperature becomes constant. }$