Question

Which is not a step of metallurgy ?

• A. Reduction
• B. Roasting
• C. Corrosion
• D. Concentration of ore

Answer 1

The correct option is C Corrosion

• Metallurgy consists of three general steps:

(1) mining the ore,

(2) separating and concentrating the metal or the metal-containing compound(ore), and

(3) reducing the ore to the metal. (reduction)

• Additional processes are sometimes required to improve the mechanical properties of the metal or increase its purity.
• Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide. In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen or sulfates.

Thus, corrosion is not a part of metallurgy. Hence, option C is correct.