Question

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(a) Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver?
(b) Out of C and CO, which is a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore? ​

Answer 1

a) The 0.5% solution of sodium or potassium cyanide is used for the leaching of silver metal.4Ag + 8NaCN + 2H2O + O2 → 4Na[Ag(CN)2] + 4NaOH Sod. dicyanoargentate

(b) CO will be a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore because in Ellingham diagram the CO2 line lies below Fe, FeO line. Hence CO reduces Fe2O3, Fe3O4, FeO etc.FeO + CO 1123K−→−−− Fe + CO2

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Answer 2

a) The 0.5% solution of sodium or potassium cyanide is used for the leaching of silver metal.

4Ag + 8NaCN + 2H2O + O2 → 4Na[Ag(CN)2] + 4NaOH Sod. dicyanoargentate (1)

(b) CO will be a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore because in Ellingham diagram the CO2 line lies below Fe, FeO line. Hence CO reduces Fe2O3, Fe3O4, FeO etc.

FeO + CO 1123K−→−−− Fe + CO2