Question

Benzene sulphonic acid is:
A.Basic
B.Acidic
C.Neutral
D.Both a and b

Answer 1

Acids: Acids are those compounds which on ionization gives ${H^ + }$.
Bases: Bases are those compounds which on ionization can give $O{H^ - }$.
Neutral: Those compounds which are neither acidic nor basic in nature, are known as neutral compounds.

Complete step by step answer:
First of all we will read about acids, bases, neutral and amphoteric.
Acids: Acids are those compounds which on ionization gives ${H^ + }$. For example: acetic acid, sulphuric acid, citric acid, etc.
Bases: Bases are those compounds which on ionization can give $O{H^ - }$. For example: alcohol, sodium hydroxide, etc.
Neutral: Those compounds which are neither acidic nor basic in nature, are known as neutral compounds. For example: water.
Amphoteric Compounds: Those compounds which act as both acids and bases, are known as amphoteric compounds. For example: oxides and hydroxides of zinc, tin , lead and aluminium.
Benzene sulphonic acid is the aromatic compound of sulphonic group. Its chemical formula is as ${C_6}{H_6}{O_3}S$. Aromatic compounds are basically those compounds which have benzene ring in the structure. In benzene sulphonic acid, sulphonic acid group ${- S{O_3}H}$ is attached to benzene ring.
Conjugate acid: Conjugate acids are the acids formed by the loss of a proton ${H^ + }$. In other words we can say that a base to which hydrogen ion is added, is known as conjugate acid. For example: the conjugate acid of water is hydronium ion${H_3}{O^ + }$. The ion formed by reaction of water with hydrogen ion, is known as hydronium ion.
Conjugate base: Conjugate bases are the base formed by the loss of a $O{H^ - }$ion. In other words we can say that an acid to which hydroxide ion is added, is known as conjugate base. For example: the conjugate base of water is hydroxide ion$(O{H^ - })$. The ion formed when water loses one hydrogen ion, is known as hydroxide ion.

So, the correct answer is Option B .

Note:
Benzene sulphonic acid is acidic in nature. But its conjugate compound i.e. benzene sulphonate is basic in nature. The chemical formula for benzene sulphonic acid is ${C_6}{H_6}{O_3}S$.