Вот решение. ))))))))))))))))))))))))))
1)Cr<span> + </span><span>HCl</span><span> = </span>CrCl2<span> + </span>H2↑
<span><span>Cr2+</span><span>21</span></span><span>2H+ + Cr = 2H + Cr<span>2+
</span></span>2)<span>4HNO3(конц.)</span><span> + </span>18HCl<span>(конц.)</span><span> + </span><span>3Pt</span><span> = </span>3H2<span>[PtCl6]</span><span> + </span>4NO↑<span> + </span>8H2O
4NO3<span> + </span>16H+ 3Pt<span> + </span>18Cl−<span> = </span>4NO<span> + </span>8H2O<span> + </span>3PtCl6
3)Ag2O + H2 = 2Ag + H2O
Ag + H = Ag + H
<span>4)?не знаю..
5)2H3PO4(разб.) + 3Mg = Mg3(PO4)2↓ + 3H2↑
2H+ + Mg = H2 + Mg+
6)PbO + H2 = Pb + H2O
Pb+ 2H = Pb + 2H</span>
2K+CL2-->2KCL
2Ba+O2-->2BaO
2Ag+S-->Ag2S
2Al+3CL2-->2AlCL3
4P+5O2-->2P2O5