Balance:-
1) Chlorine gas burns in hydrogen gas to give hydrogen chloride
2) Barium Chloride reacts with Zinc Sulphate to give ZincChlorideand BariumSulphate as precipitate
3) Hydrogen Sulphide gas burns in air to give water and sulphur dioxide
4) Aluminium metal replaces iron from ferric oxide

1) Cl​2+H2----->2HCl
2)BaCl2+ZnSO4---->BaSO4+ZnCl2
3)2​H​2S+3O2-------->2H2O+2SO2
4
)2Al+ Fe2O3--->Al2O3+2Fe
 

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