Which of the following is endothermic reaction

Options

(a) 3H₂+ N₂ → 2NH₃
(b) C + O₂ → CO₂
(c) PCl₃ + Cl₂ → PCl₅
(d) N + (1/2)O₂ → NO

Correct Answer:

N + (1/2)O₂ → NO

Explanation:

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