Question

Assertion (A) : The boiling point of water decreases as the altitude increases. 

Reason (R) : The atmospheric pressure increases with altitude. 

Codes : 

(a) Both A and R are true and R is the correct explanation of A 

(b) Both A and R are true but R is not a correct explanation of A 

(c) A is true but R is false 

(d) A is false but R is true

Answer 1

(c) The boiling point of an element or a substance is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. As altitude increases, atmospheric pressure decreases, so boiling point decreases, so the liquid would boil at a lower temperature.