Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Given below are two statements
Assertion
A
: The enthalpy of formation of graphite is taken as zero.
Reason (R): Graphite is thermodynamically most stable allotrope of carbon
The correct answer is
Both and (R) are correct and (R) is the correct explanation of
is correct but (R) is incorrect
is incorrect but (R) is correct
Reason (R): Graphite is thermodynamically most stable allotrope of carbon
The correct answer is
Both and (R) are correct and (R) is the correct explanation of
is correct but (R) is incorrect
is incorrect but (R) is correct
B
Both 
and 
are correct but 
is not the correct explanation of 
and are correct but is not the correct explanation of Text Solution
Verified by ExpertsThe correct answer is:
A
The enthalpy of formation of a substance is the amount of energy required to prepare it from its constituents in their most stable states.
Since graphite is the most stable allotrope of carbon, its enthalpy of formation is zero.
Thus, both Assertion and Reason (R) are correct statements and Reason (R) explains Assertion .
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