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Допиши уравнения химических реакций:

а) \(\mathrm{Fe\_2O\_3} +\) [ ] \(\to\) [ ] \(\mathrm{Fe(NO\_3)\_3} +\) [ ] \(\mathrm{H\_2O}\) ;

б) \(\mathrm{CuO} +\) [ ] \( \mathrm{HCl} \to\) [ ] \(+ \mathrm{H\_2O}\) ;

в) \(\mathrm{Mg} +\) [ ] \(\to \mathrm{MgSO\_4} +\) [ ];

г) \(\mathrm{H\_2CO\_3} +\) [ ] \(\to \mathrm{Na\_2CO\_3 + H\_2O}\) ;

д) [ ] \(\mathrm{KClO\_3} \to\) [ ] \(\mathrm{KCl}+\) [ ] \(\mathrm{O\_2}\) .