Unit 30 Exercise 7. Chloric(V) acid (HClO3) is an oxidizing agent. When it is added to iron(II) sulphate solution in the presence of sulphuric acid, the pale green iron(II) sulphate solution turns yellowish brown. A yellowish green gas with a pungent smell is also detected. (a) Suggest why the iron(II) sulphate solution turns yellowish brown. (b) Suggest what the pungent gas is. (c) Write the half equation for the reduction reaction involved. (d) Write the redox equation for the reaction involved