3) 1. 2Al+Cr2O3=Al2O3+2Cr
2.3C+CaO=CaC2+CO
3.3Ca+2P=Ca3P2
4.4Li+O2=2Li2O
5.2Na+O2=Na2O2
6.LiH+H2O=LiOH+H2
5)В
3) 1. 2Al+Cr2O3=Al2O3+2Cr
2.3C+CaO=CaC2+CO
3.3Ca+2P=Ca3P2
4.4Li+O2=2Li2O
5.2Na+O2=Na2O2
6.LiH+H2O=LiOH+H2
5)В