In double displacement type of reaction the positive ions switch between two compounds and form two brand new compounds.
A double displacement is defined as a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds.
The double-displacement reaction generally represented in the form of AB + CD → AD + CB where A and C are positively-charged cations, while B and D are negatively-charged anions.
Some of the examples of double displacement reaction are given as,
NaOH + NH₄Cl ⇄ NaCl + NH₄OH
AgNO₃ + NaCl ⇄ AgCl + NaNO₃
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