How will `K_2Cr_2O_7` oxidise: Hydrogen sulphide to sulphur.

How will K_2Cr_2O_7 oxidise: Ferrous sulphate to ferric sulphate.

Why nitric acid acts as an oxidising agaent? How it oxidises: Hydrogen Sulphide to sulphur.

How will ozone oxidise the following : Lead sulphide to lead sulphate

How will ozone oxidise the following : Copper sulphide to copper sulphate

How will ozone oxidise the following : Cadmium sulphide to cadmium sulphate

State what happens when a solid mixture of KCl and K_2Cr_2O_7 is heated with conc. sulphuric acid. Give balanced chemical equation.

How is K_2Cr_2O_7 prepared ? Write chemical equations.

Why nitric acid acts as an oxididing agent? How it oxidises: Sulphur to sulphuric acid.