Give one example of an oxidation-reduction reaction which is also :

(a) a combination reaction

(b) a displacement reaction

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Solution

(a)

$2 H_{2} + O_{2} ⟶ 2 H_{2} O$

Here, Oxygen is added so it is oxidation reaction and also Hydrogen is added so it is reduction reaction.

Therefore, it is redox reaction.

and also here two substance are combined to make single product so it is a combination reaction.

(b)

Displacement reaction is a also redox reaction, as in this reaction, the less reactive reactant gets reduced and the more reactive reactant gets oxidized.

In the following reaction Fe displaces Cu from $C u S O_{4}$ .Fe gets oxidised while Cu gets reduced.

$F e (s) + C u S O_{4} (a q) ⟶ F e S O_{4} (a q) + C u (s)$

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Similar questions

The process of respiration is :

(a) an oxidation reaction which is endothermic

(b) a reduction reaction which is exothermic

(d) an oxidation reaction which is exothermic

Question 3

Define combination reaction. Give an example of a combination reaction that is also exothermic.

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

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