下列化学方程式正确的是（ ）
A．Mg+O2═MgO2
B．H2O2═H2O+O2↑
C．H2+CuO
Cu+H2O △ .
D．2H2O
2H2+O2 通电 .
A、镁条燃烧生成氧化镁，反应的化学方程式为2Mg+O2
2MgO，故A错误； 点燃 .
B、，双氧水分解生成水和氧气，反应的化学方程式为2H2O2
2H2O+O2↑，故B错误； MnO2 .
C、氢气的还原氧化铜生成铜和氧气，反应的化学方程式为H2+CuO
Cu+H2O，故C正确； △ .
D、水通电分解生成氧气和氢气，反应的化学方程式为2H2O
2H2↑+O2↑，故D错误． 通电 .
故选：C．
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