$xCu\,\,\, + \,\,\,\,yHN{O_3}\,\,\, \to \,\,\,\,xCu{\left( {N{O_3}} \right)_2}\,\,\, + \,\,\,NO\,\,\,\, + \,\,\,N{O_2}\,\,\, + \,\,\,3{H_2}O$ તે સર્હીુણકો $x$ અને $y$ શું હશે ?
$2Cu\,\,\, + \,\,\,\,6HN{O_3}\,\,\, \to \,\,\,\,2Cu{\left( {N{O_3}} \right)_2}\,\,\, + \,\,\,NO\,\,\,\, + \,\,\,N{O_2}\,\,\, + \,\,\,3{H_2}O$
${N_2} + 3{H_2} \longrightarrow NH_3$
$xMn{O_4}^ - \, + \,y{H_2}S{O_4}\, \to \,2M{n^{2 + }}\, + \,5{H_2}O\, + \,z{e^ - }$
$Fe\, + \,{H_2}O\, \to \,F{e_3}{O_4}\, + \,{H_2}$