Which compound is called the king of chemicals?

 Sulphuric acid.
It is more reactive than any other acid or base.The strength of an acid or base depends upon the ease with which hydrogen ions or hydroxyl ions are released.Since sulphuric acid releases these ions with much ease,they are more reactive.When heated slightly,it becomes very reactive and can cause permanent scars on the skin.

it is sulphuric acid by simple reasons like : 1) it is uesd for the extraction of many metals.

2) it is used in many chemical factories for the production on substances

3) affordable ad easily available... etc

4) highly reactive

H₂SO₄

 Of all the acids, sulphuric acid is the most important one. In almost all industries, sulphuric acid is used directly or indirectly. Hence it is called the "King of chemicals". It is said that the material prosperity of a country may be determined by the amount of sulphuric acid consumed by that country.

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sulphuric acid