Question

Fe+H2So4=
Al+HCl=
K+H2O=
Ba+H2O=

Answer 1

Fe + H2SO4 = FeSO4 + H2
2Al + 6HCl = 2AlCl3 +3 H2
2K + 2H2O = 2KOH + H2
Ba + 2H2O = Ba(OH)2 + H2

Answer 2

Fe + H2SO4 (конц.) = Fe2(SO4)3 + SO2 + H2O
2Al+6HCl=2AlCl3+3H2↑
2 K + 2 H2O = 2 KOH + H2↑
Ba + 2H2O = Ba(OH)2 + H2↑