Question

Normal boiling point of water is `373 K`. Vapour pressure of water at `298 K` is `23 mm` enthalpy of vaporisation is `40.656 kJ mol^(-1)` if atmopheric pressure becomes `23 mm`, the water will boil at:
A. (a) `250 K`
B. (b) `298 K`
C. ( c) `51.6 K`
D. (d)`12.5 K`

Answer 1

Correct Answer - B
Boiling point of a solvent is a characterstic temperature at which `V.P` of liquid becomes equal to `1 atm`. A decrease in pressure results a decrease in temperature at which water boils.