V2O5+H2= Cr2O3+ Al= SnO2+C= TiCl4+Mg=
V2O5 + 5H2=2V+5H2O
Cr2O3+2Al=Al2O3+2Cr
SnO2+C=Sn+CO2
2 TiCl4 + Mg = MgCl2 + 2 TiCl3