Question

(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. In the metallurgy of silver and that of gold, the respective metal is leached with a dilute solution of NaCN or KCN in the presence of air (for $O_2$).

b. CO is a better reducing agent at lower temperature range 500-800 K in the blast furnace to extract iron from oxide ore.