NCERT solution Class 10 chemical reactions and equations

NCERT Solutions

Class 10 Science

Chemical Reactions and Equations

NCERT Questions

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Q.13

What is the difference between displacement and double displacement reactions?

Write equations for these reactions.

Displacement Reaction: - In, displacement reaction more reactive metal displace less reactive metal from its compound. They are generally represented as:

A + BX à AX + B; where A is more reactive than B

A very reactive chemical species can replace an anion or a cation of a compound. This displacement occurs according to the reactivity series. It is a slow reaction and change of colour takes place.

For Example: - (a) Zn + HCl à ZnCl₂ + H₂

In the above equation hydrogen is being displaced from HCl by Zn.

(b) Fe_(s) + CuSO_{4 (aq)} → FeSO_{4 (aq)} + Cu_(s)

(Copper sulphate) (Iron sulphate)

In this reaction, iron has displaced or removed another element, copper, from copper sulphate solution. This reaction is known as displacement reaction.

Double Displacement reaction: - Two atoms or group of atoms interchange in order to form new compounds. There is exchange of ions.

It is generally represented as;

AB + CD à AD + CB

It is a fast process and a precipitate is formed in these types of reactions.

For Example: - (1) HCl + NaOH à NaCl + H₂O

(2) Na₂SO_{4 (aq)} + BaCl_{2 (aq)} → BaSO_4(s) + 2NaCl_(aq)

(Sodium sulphate) (Barium chloride) (Barium sulphate) (Sodium chloride)

The white precipitate of BaSO₄ is formed by the reaction of SO₄^2– and Ba²⁺. The other product formed is sodium chloride which remains in the solution.

Video solution:

Chemical Reactions and Equations Class 10 Science NCERT Chapter 1 NCERT Solutions

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