Question

Boiling point of the water on the Celsius scale will be,
$\begin{array}{rl}& A.0{}^{\circ }C\\ & B.212{}^{\circ }C\\ & C.32{}^{\circ }C\\ & D.100{}^{\circ }C\end{array}$

Answer 1

Hint: Impurities in the water can affect the boiling temperature at which the water can boil in a small amount. And also a much larger variation in the boiling temperature can be observable at different altitudes from the sea level. The boiling point at the sea level will not be equal to the same at the peaks of Himalaya. This all will help you in solving this question.

Complete step-by-step answer:
Celsius which is also referred to as centigrade is a scale based on $0{}^{\circ }$ in the case of the freezing point of water and $100{}^{\circ }$ in the case of the boiling point of the water. The Celsius scale is in common use wherever the metric system of the units has been taken care of. This has been commonly used in scientific work everywhere nowadays. Celsius has used $0{}^{\circ }$ as the melting point of the snow and $100{}^{\circ }$ as the boiling point of water. This became the reason for the inversion of keeping $0{}^{\circ }$ on the cold end and also $100{}^{\circ }$ on the hot end. In this way it has gained a lot of recognition and is nowadays used as widespread. Hence the boiling point of water in Celsius scale is mentioned to be $100{}^{\circ }C$.

So, the correct answer is “Option D”.

Note: This scale was invented in 1742 by a Swedish astronomer named as Anders Celsius. That is why the scale has been named Celsius scale. This scale has been often known as the centigrade scale due to the $100{}^{\circ }$ interval between the particular fixed points. If the atmospheric pressure gets decreased the water can boil at even smaller temperatures also. That is why as the height increases, the boiling point of the water also decreases.