GKFix MCQ Question

Which of the following is NOT a disproportionation reaction?

• A. (a) N₂(g) + O₂(g) → 2NO(g)
• B. (b) 2Pb(NO₃)₂(s) → 2PbO(s) + 4NO₂(g) + O₂(g)
• C. (c) NaH(s) + H₂O(l) → NaOH(aq) + H₂(g)
• D. (d) 2NO₂(g) + 2OH⁻(aq) → NO₂⁻(aq) + NO₃⁻(aq) + H₂O(l)