Question

Assertion (A) The enthalpy of both graphite and diamond is taken to be zero, being elementry substances.
Reason (R) The enthalpy of formation of an elementary substance in any state is taken as zero.

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

Answer 1

Answer: (D)

Enthalpy of element in most stable state is zero. Diamond is not a stable state of carbon.