Question

Which of the following acids is called the king of the acids?
A.Acetic acid
B.Phosphoric acid
C.Oxalic acid
D.Sulphuric acid

Answer 1

An acid is any hydrogen containing substance that is capable of donating a proton to another substance. The acid which is the strongest and is used in many industrial processes is known as the king of acids.

Complete step by step answer:
Sulfuric acid is a strong acid with the formula ${H_2}S{O_4}$ .It is also known as Mattling acid or Oil of vitriol. It has a strong acidic nature and is corrosive. Moreover, at higher concentrations, it acts as an oxidizing agent and dehydrating agent.
Basically, this acid is manufactured by a method known as contact process. Various steps that are involved in this process are listed below:
Preparation of Sulphur dioxide
$S(s) + {O_2}(g) \to S{O_2}(g)$
Conversion of Sulphur dioxide into Sulphur trioxide
Conversion of Sulphur trioxide into concentrated ${H_2}S{O_4}$
${H_2}S{O_4} + S{O_3}(g) \to {H_2}{S_2}{O_7}$
${H_2}{S_2}{O_7}(l) + {H_2}O(l) \to 2{H_2}S{O_4}$
Moreover, it is basically produced from Sulphur. In the presence of air, Sulphur dioxide is first obtained by burning the molten Sulphur and after that it is converted to Sulphur trioxide in the presence of vanadium pentoxide.
Therefore, sulfuric acid is called the king of acids because of its wide range of use in laboratories and chemical industries.

Hence, option D is correct.
Note:
Sulphuric acid is used in making fertilizers, in the production of steel and iron, in industries to remove the rust from steel and iron. Moreover, it is used as a catalyst to convert cyclohexane oxime to caprolactam, in lead acid batteries as an electrolyte and many more.