Question

Assertion The enthalpy of formation of gaseous oxygen molecules at $298\, K$ and under a pressure of one atmosphere is zero.
Reason The entropy of formation of gaseous oxygen molecule under the same conditions is zero.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (C)

Standard enthalpy of formation of gaseous oxygen molecule is zero.
Entropy of formation of even elementary substances at $298 \,K$ and one atmosphere is not zero.