NEET Chemistry Enthalpy MCQ Question
Refer to the diagram showing the enthalpy changes of various reactions. Which of the following reactions corresponds to the highest enthalpy of atomization?
CH4(g) → C(g) + 4H(g); ∆aH = 1665 kJ mol–1
H2(g) → 2H(g); ∆aH = 435.0 kJ mol–1
Na(s) → Na(g); ∆aH = 108.4 kJ mol–1
Cgraphite(s) + O2(g) → CO2(g); ∆rH = –393.5 kJ mol–1
Correct Answer
Detailed Explanation
The enthalpy of atomization is the energy required to break one mole of bonds to obtain atoms in the gas phase. CH4 has the highest ∆aH value at 1665 kJ mol–1, indicating the highest enthalpy of atomization.
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