Which chemical is known as the king of chemicals?(1) H2CO3(2) HCl(3) CH3COOH(4) H2SO4

Answer: 

(4) H2SO4 Sulphuric acid

The strong acid with hygroscopic and oxidising properties is the sulphuric acid and thus called the King of the chemicals. It is also a mineral acid. Sulphuric acid is also called matting acid or oil of vitriol. Sulphuric acid at high concentrations acts as an oxidising agent and dehydrating agent. It is strongly acidic in nature and is corrosive. 20% of Sulphuric acid is only used in the chemical industry