Question

Why sulphuric acid is often known as the king of chemicals.
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Answer 1

because it is a strong mineral acid

Answer 2

Sulphuric acid is manufactured in larger quantities than any other acid. Almost every manufactured item in the modern world comes into contact with H2SO4 at some stage in its history. It is so important, that at one time the annual production of sulphuric acid was taken as a measure of the degree of industrialisation of a country, and earned it its nickname of the 'king of chemicals'. Sulphuric acid is familiar to us as the electrolyte in the lead acid batteries in automobiles.

It is called king of acid because of its direct and indirect applications in manufacture of many chemicals including fertilisers. Sulphuric acid is used to clean up rust from steel rolls and soap. It also dissolves its own compounds. It replaces salts from weaker acids. It is ideal to call sulphuric acid as king of chemicals .It is corrosive acts as good dehydrant.