Double Displacement Reaction MCQs Quiz | Class 10

Class X Science (Code 086), Unit I: Chemical Substances – Nature and Behaviour. This quiz covers the definition, identification, and examples of double displacement reactions, including precipitation and neutralization. Attempt these 10 MCQs to test your understanding, then submit to view your score and download the solution PDF.

Understanding Double Displacement Reactions

A Double Displacement Reaction is a type of chemical reaction where two compounds react, and the positive ions (cations) and the negative ions (anions) of the two reactants switch places, forming two new compounds or products.

General Representation

The reaction is generally represented as:

AB + CD -> AD + CB

Here, A and C are cations, while B and D are anions. Ion A combines with ion D, and ion C combines with ion B.

Key Characteristics

  • Exchange of Ions: The defining feature is the mutual exchange of ions between reactants.
  • Precipitate Formation: Many double displacement reactions result in the formation of an insoluble solid called a precipitate. These are known as precipitation reactions.
  • Change in Color: The formation of a precipitate often brings a distinct color change (e.g., Yellow precipitate of Lead Iodide).

Common Examples & Colors

Reactants Precipitate Formed Color of Precipitate
Sodium Sulphate + Barium Chloride Barium Sulphate (BaSO4) White
Lead Nitrate + Potassium Iodide Lead Iodide (PbI2) Yellow
Silver Nitrate + Sodium Chloride Silver Chloride (AgCl) White

Types of Double Displacement

1. Precipitation Reaction: An insoluble solid is formed. Example: BaCl2(aq) + Na2SO4(aq) -> BaSO4(s) + 2NaCl(aq).

2. Neutralization Reaction: An acid reacts with a base to form salt and water. Example: HCl + NaOH -> NaCl + H2O.

Practice Questions

  1. Write the balanced chemical equation for the reaction between Lead Nitrate and Potassium Iodide.
  2. Why is double displacement also called metathesis?
  3. Identify the precipitate color when Silver Nitrate reacts with Potassium Bromide.
  4. Is the reaction between Vinegar and Baking Soda a double displacement reaction? Explain.
  5. Differentiate between displacement and double displacement reactions.