1)
FeS + H_{2}SO_{4}=FeSO_{4}+H_{2}S
NaOH + HBr=NaBr+H_{2}O
MgO + Na_{2}O\neq
HNO3+SiO2\neq " alt="FeO+H_{2}SO_{4}=FeSO_{4}+H_{2}O
FeS + H_{2}SO_{4}=FeSO_{4}+H_{2}S
NaOH + HBr=NaBr+H_{2}O
MgO + Na_{2}O\neq
HNO3+SiO2\neq " align="absmiddle" class="latex-formula">
2)
2N^{0}+6e=2N^{-3} C^{0}-4e=C^{+4} " alt="2N_{2} + 3C + 6H_{2}O=3CO_{2} +4NH_{3}
2N^{0}+6e=2N^{-3} C^{0}-4e=C^{+4} " align="absmiddle" class="latex-formula">
3)Cu(OH)2+2HCl=CuCl2+2H2O
Cu(OH)2+2H(+)+2Cl(-)=Cu(+2)+2Cl(+)+2H2O
Cu(OH)2+2H(+)=Cu(+2)+2H2O
Li2O+2HNO3=2LiNO3+H2O
Li2O+2H(+)+2NO3(-)=2Li(+)+2NO3(-)+H2O
Li2O+2H(+)=2Li(+)+H2O
4)MgSO4;HI;KCl;Al(NO3)3;NaOH;HNO3