Question

which is not pyrochemical process?​

Answer 1

Answer:

b is right answer

Explanation:

because it not produce smelting in substance

Answer 2

Process which is not pyrochemical is - d) corrosion

Pyro means heating at high temperatures, hence pyrochemical process is the one involving chemical reaction at high temperature.

Roasting is the process which involves heating metal sulphide ore at temperature around 225-230° C.

Calcination is the process where heating is done in absence of air or very limited supply of air. The temperature used is around 550-1150° C.

Smelting is the process where heating is done beyond melting point. The heating can be done in presence of oxygen or coke.