(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 rangein the blast furnace to extract iron form the oxide ore ?

Out of C and CO, which is a better reducing agent at 673K?

Out of C and CO, which is better reducing agent for ZnO?

From the Ellingham graph between Gibbs energy and temperature , out of C and CO which is a better reducing agent for ZnO ?

Following is used as a reducing agent in metallurgy i.e. extraction of metals in blast furnace.

Statement-1:In cyanide process for the extraction of gold and silver from their native ores, the cyanide solution acts as a reducing agent to reduce the gold and silver compounds present in the ores, into the metallic states. Statement-2:In the extraction of gold and silver the cyanide solution acts as complexing reagent in the presence of air and form their respective soluble complexes.

A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B', which on passing through an alkaline solution of ptassium tetraiodomercurate (II) solution gives a brown ppt. the substance 'A' on heating eveolves a neutral gas 'C', which is inert at room temperature and reactive a presence of catalyst and does ont give grown fumes with nitric oxide. Q. The gas 'C' is:

A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B', which on passing through an alkaline solution of ptassium tetraiodomercurate (II) solution gives a brown ppt. the substance 'A' on heating eveolves a neutral gas 'C', which is inert at room temperature and reactive a presence of catalyst and does ont give grown fumes with nitric oxide. Q. The gas 'B' is:

A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B', which on passing through an alkaline solution of ptassium tetraiodomercurate (II) solution gives a brown ppt. the substance 'A' on heating eveolves a neutral gas 'C', which is inert at room temperature and reactive a presence of catalyst and does ont give grown fumes with nitric oxide. Q. The substance 'A' is:

In the cyanide extraction process of silver form argentite ore , the oxidizing and reducing agents used are

Explain the following (a) CO_(2) is a better reducing agent below 710 K whereas CO is a better reducing agent above 710 K . (b) Generally sulphide ores are converted into oxides before reduction. ( c) Silica is added to the sulphide ore of copper in the reverberatory furnance. (d) Carbon and hydrogen are not used as reducing agents at high temperature. (e) Vapour phase refining method is used for the purification of Ti