Chemical Thermodynamics and Thermochemistry: Mixed MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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MixedEasyQuestion 800013

Question

Enthalpy of formation of an element in its standard state is:

A
Zero by convention
Correct
B
+ve
C
−ve
D
Depends on element

Correct answer

Zero by convention

Explanation

By convention, the standard enthalpy of formation (ΔHf°) of any element in its standard state (most stable allotrope) is defined as zero. E.g., ΔHf°(O₂ gas) = 0.

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