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CGP EDU Academic Team
Published on: August 13, 2026
Choose the reaction(s) from the following options, for which the standard enthalpy of reaction is equal to the standard enthalpy of formation.
A
2C(g) + 3H 2 (g) 
C 2 H 6 (g)
C 2 H 6 (g)
B
C
2H 2 (g) + O 2 (g) 
2H 2 O 
2H 2 O
D
S 8 (s) + O 2 (g) 
SO 2 (g)
Text Solution
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CHECK THE SOLUTION.
(b, d)
Standard enthalpy of formation of a compound is the standard enthalpy when one mole of a compound is formed from the elements in their stable state of aggregation.
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