Question

Assertion : At room temperature water does not sublimate from ice to steam.

Reason : The critical point of water is much above the room temperature.

(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 correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option (c) A is true but R is false

Explanation :

We cannot get steam directly from ice. There is one intermediate state of water called liquid whose temperature has to be raised to 100°C before we can get steam. Critical point is that temperature at which a gas can be liquefied by applying pressure. So, water cannot have a critical point.