Metallurgical Processes

Wrought iron is a very pure form of iron with a very low carbon content, typically less than 0.08 percent, fitting within the 0.05-1 percent range.

This is the correct option. Coke is used as a reducing agent in the extraction of metals like iron and zinc.

For every copper ion discharged at the cathode, a copper ion is released into the solution at the anode. The sulphate and the hydroxyl ions remain as spectator ions. The total number of copper and sulphate ions remain constant throughout. Assuming that no evaporation takes place, the blue color of the copper sulphate is maintained throughout.

The Haber Process combines nitrogen from the air with hydrogen derived mainly from natural gas (methane) into ammonia. The reaction is reversible and the production of ammonia and  is exothermic.The catalyst is actually slightly more complicated than pure iron. It has potassium hydroxide added to it as a promoter - a substance that increases its efficiency.

Galvanization is the process of applying a protective zinc coating to steel or iron to prevent rusting. The zinc acts as a sacrificial anode to protect the underlying metal.

'Iron' is not the only precious metal. Therefore, option 3 is eliminated. Also, word 'useful' does not start with a vowel soundbut has the sound of 'y'. Thus, option 2 is also eliminated. Hence, option 1.

This option is correct because the leaching of gold means gold cyanidation of gold and for silver ores cyanidation of silver. Potassium cyanide (KCN) is used for extraction of gold and silver with respect to water to form soluble coordination complexes (K[Ag(CN)₂], K[Au(CN)₂]).

In current use, the term refers to the coating of steel or iron with zinc. This is done to prevent rusting of the ferrous item. The value of galvanizing stems from the relative corrosion resistance of zinc, which, under most service conditions, is considerably less than those of iron and steel.

Calcination is the process of heating an ore in the absence of air to remove volatile impurities or moisture, typically below the melting point.

Zone refining (or zone melting) is a technique used to purify metals by moving a molten zone through the material, which carries impurities along with it.

Roasting is a metallurgical process where sulfide ores are heated in the presence of excess air. Calcination, by contrast, involves heating in the absence or limited supply of air.

Zone refining is a highly effective method for purifying semiconductors like silicon and germanium to the extremely high levels of purity required for electronic applications.

Highly reactive metals like sodium are obtained by the electrolysis of their molten salts (electrometallurgy) because they cannot be reduced by common chemical reducing agents.

Metallurgy is the branch of science and technology concerned with the properties of metals and their production and purification from ores.

Extraction is the general term for the process of obtaining a metal from its ore through various chemical and physical methods.