Why is you can say that double displacement or double decomposition reaction is not the example of redox reaction?

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Solution

1. In a redox reaction, one element is being oxidised while other is being reduced. For e.g:

C(s) + O₂(g) $\to$ CO₂(g)
Oxidation state: 0 0 +4 -2

Thus C is oxidised from 0 to +4 while O is reduced from 0 to -2.

2. In a double displacement reaction, no oxidation or reduction takes place. Only the exchange of ions takes place.

AgNO₃(aq) + NaCl(aq) $\to$ AgCl(s) + NaNO₃(aq)

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