Question

Assertion : The enthalpy of formation of gaseous oxygen molecules at 298 K under a pressure of one atm is zero.

Reason : The entropy of formation of gaseous oxygen molecules under the same conditions is zero.

(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:

The heat of formation of all the elements in their standard states are arbitrarily assumed to be zero.