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R/. 4NH3 + 5O2 -----> 4NO + 6H2O
FE2O3 + CO ---- FE+ CO2
R/. Fe2O3 + 3CO -----> 2Fe + 3CO2
CuS+O2----> Cu2O +SO2
R/. 4CuS + 5O2 -----> 2Cu2O + 4SO2
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