Укажіть речовину-окисник і речовину-відновник у кожній реакції:

a)      AL+S→tAL2S3;

b)      Li2O+Si→tLi+SiO2;

c)       Fe2O3+C O →tFe+CO2;

d)      NH3+CuO→tCu+N2+H2O.

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