24. All of the following reactions are described as decomposition reactions      except     
(A) PCl₅(g) → PCl₃(g) + Cl₂(g).
(B) 2H₂O(g) → 2H₂(g) + O₂(g).
(C) CH₄(g) + Cl₂(g) → CH₃Cl(g) + HCl(g).
(D) CaCO₃(s) → CaO(s) + CO₂(g).
(E) 2HgO(s)→2Hg(l)+O₂(g)

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