Question 2 Page 13 - Chapter 1 Class 10 - Chemical Reactions and Equations

Give an example of a double displacement reaction other than the one given in Activity 1.10. 

Answer

Double Displacement is a type of chemical reaction in which two compounds react and their positive and negative ions switch places to form two new products.

Example

When Potassium Iodide solution is added to Lead Nitrate solution

A yellow precipitate of Lead Iodide is formed along with Potassium Nitrate solution

Explanation

The positive and negative ions of Potassium iodide (KI) are K ⁺ and I ^-

The positive and negative ions of Lead Nitrate (Pb(NO ₃ ) ₂ ) are Pb ²⁺ and NO _{3 -}

The positive ions of both the compounds switch places,

K + combines with NO _{3 -} , forming  KNO 3

Pb ²⁺ combines with I ^- forming PbI ₂