Question

Name the method used for the preparation of the following salt from the options.

Lead chloride

• A. Decomposition by acid
• B. Double decomposition
• C. Direct synthesis
• D. Simple displacement
• E. Neutralization

Answer 1

The correct option is B

Double decomposition

Correct answer is option d) Double decomposition

Definition of double decomposition reaction

It is a type of decomposition reaction in which products obtained by interchanging the ions of reactants.

• When lead nitrate react with hydrochloric acid, lead chloride and nitric acid is formed.
• Here Pb²⁺ and H⁺ ions are interchanged their position.

Pb(NO₃)₂(aq) + 2 HCl (aq) $\to$PbCl₂ (aq) +2 HNO₃(aq)
Explanation of incorrect answers

A) Decomposition reaction

When a compound dissociates into simpler substance is called Decomposition reaction.

H₂O(l) $\to$ H₂ (g) + O₂ (g)

C) Direct synthesis

A reaction in which two or more simpler substances combine to form a compound is called direct synthesis.

For example, Potassium and chlorine react to form potassium chloride.

2K(s)+Cl₂ (g) $\to$ 2KCl(s)

D) Simple displacement reaction

When an element displaces another element in a compound is called simple displacement reaction.

Zn(s) +2HCl (aq) $\to$ ZnCl₂ (s )+H₂(g)

E) Neutralization

When an acid react with base, a salt and water is formed. This process is called neutralisation reaction.

NaOH(aq) + HCl(aq) $\to$ NaCl(aq) + H₂O(l)

Base Acid Salt water