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OpenStudy (anonymous):
Which one of the following is a combustion reaction? A. CH4 + 2O2 → CO2 + 2H2O B. Ba(OH)2 + 2HClO4 → Ba(ClO4)2 + 2H2O C. 4Fe + 4O2 → 2Fe2O3 D. Zn + HCl → ZnCl2 + H2
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