Question

What is the boiling point of water?

(a) 100 °F

(b) 671.67 °R

(c) 373 °C

(d) 212 °r

This question was posed to me in class test.

Question is taken from Vapour Pressure of Liquid Solutions in division Solutions of Chemistry – Class 12

Answer 1

Right choice is (b) 671.67 °R

For explanation I would say: °R represents the temperature measured on Rankine scale. Typically, boiling point of water is measured as 100 °C on the Celsius scale. The conversion of Celsius to Rankine scale is R = C x 9/5 + 491.67.

Considering boiling point of water as 100 °C, R = 100 x 9/5 + 491.67 = 671.67 °R

°F, °r represent the Fahrenheit and Reaumur scale, respectively.