Assertion : The normal boiling point of water is `100 C^(@)` and standard boiling point of water is `99.6 C^(@)` .
Reason : The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure .

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion .
B. If both assertion and reason are true but reason is not the correct explanation of assertion .
C. If assertion is true but reason is false .
D. If both assertion and reason are false .

Answer

B

Explanation

At 1 atm pressure, boiling temperature is called normal boiling point and if pressure is 1 bar then the boiling point is called standard boiling point of the liquid. 1 bar pressure is slightly less than 1 atm pressure therefore, standard boiling point of the liquid is slightly lower than the normal boiling point.