Question

Which of the following is not an acidic salt:
A.\[CuS{O_4}\]
B.\[N{a_2}C{O_3}\]
C.$ZnS{O_4}$
D.$N{H_4}N{O_3}$

Answer 1

Hint:To answer this question, you should recall the concept of different types of salts. The different types of salts are acidic salt, basic salt, double salt and mixed salts. The salts formed by a strong acid and weak base are called acidic salts.

Complete step by step answer:
Salt refers to an ionic compound that has a cation other than \[{H^ + }\] and an anion other than \[O{H^-}\] and is formed along with water in the neutralization reaction between acids and bases. The basic type of salt is formed by the partial neutralization of a strong base by a weak acid is known as a basic salt. These salts hydrolysis to form a basic solution hence are named as basic salts.
Copper sulphate is formed by reaction of a strong acid, \[{H_2}S{O_4}\] with a weak base \[Cu{\left( {OH} \right)_2}\].
Similarly zinc sulphate is formed by reaction of sulphuric acid and zinc hydroxide.
Ammonium nitrate formed by reaction of nitric acid and ammonium hydroxide. The presence of strong acid as a reactant makes the aqueous solution of these salts acidic.
Sodium carbonate \[N{a_2}C{O_3}\] is not an acidic salt. It is a basic salt. It is a salt of the strong base \[NaOH\] with weak acid \[{H_{2}}C{O_3}\] ​. Aqueous sodium bicarbonate solution has pH more than 7.

Hence, the correct answer is option B.

Note:
The different types of salts based on their constituents
1. Acidic salt: The salt resulting from partial neutralization of a polyprotic acid is known as an acidic salt. These salts have ionizable \[{H^ + }\] ions along with another cation. Examples of this type of salt are etc.
2. Basic or Alkali Salt: This type of salt is formed by the partial neutralization of a strong base by a weak acid is known as a basic salt. These salts hydrolysis to form a basic solution. Example of this type of salt is: White lead \[\left( {2PbC{O_3}.Pb{{\left( {OH} \right)}_2}} \right)\]
3. Double salt: These types of salts contain more than one cation or anion is known as double salt. They are obtained by the combination of two different salts crystallized in the same ionic lattice. Example of this type of salt is Potassium sodium tartrate \[(KNa{C_4}{H_4}{O_6}.4{H_2}O)\]which is also known as Rochelle salt.
4. Mixed Salts: These types of salts are made up of a fixed proportion of two salts, often sharing either a common cation or common anion is known as mixed salt.