Explain the following types of chemical reactions giving two examples for each of them.

(a) Displacement reaction

(b) Double decomposition reaction

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Solution

(a) A displacement reaction is a reaction in which a more active element displaces a less active element from a compound.

AB + C→CB + A

e.g. (i) Zinc displaces copper from copper sulphate solution.

Zn + CuSO₄ (aq) → ZnSO₄ (aq) + Cu

(ii) Iron piece when added to copper sulphate solution, copper is displaced.

Fe + CuSO₄ → FeSO₄ + Cu

(d) A double displacement reaction is a chemical reaction in which two compounds in their aqueous state exchange their ions to form new compounds.

AB+CD→CB+AD

e.g (i) AgNO₃ + HCl ⟶ AgCl + HNO₃ (aq)

(ii) NaOH(aq)+ HCl(aq)⟶ NaCl(aq) + H₂O

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Explain the following types of chemical reactions giving two examples for the each of them :

(a) combination reaction

(b) decomposition reaction

(d) double displacement reaction

Explain giving one example for each of the following chemical changes :

(a) Double decomposition

(b) Thermal dissociation

(d) Displacement reaction

Consider the reaction :

$K B r (a q) + A g N O_{3} (a q)$ $⟶$ $K N O_{3} (a q) + A g B r (s)$

This is an example of :

(a) decomposition (b) combination reaction

Give two examples of double displacement reactions with their chemical equations.

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