In the type of reaction in which __compounds exchange their positive and negative radicals called_

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Solution

Double displacement reaction
It is a chemical reaction in which two compounds in their aqueous solutions react to form two new compounds by the mutual exchange of their radicals.
In general double decomposition reaction can be represented as
$AB + CD \overset{}{\to} AD + BC$
For example when barium chloride $({BaCl}_{2})$ reacts with sulphuric acid $(H_{2} {SO}_{4})$ , they undergo mutual exchange of their radicals resulting in the formation of barium sulphate $({BaSO}_{4})$ and hydrochloric acid $(HCl)$ .
$\underset{barium chloride}{{BaCl}_{2} (aq)} + \underset{sulphuric acid}{H_{2} {SO}_{4} (aq)} \overset{}{\to} \underset{barium sulphate}{{BaSO}_{4} (s) ⇣} + \underset{hydrochloric acid}{2 HCl (aq)}$
Therefore, in the type of reaction in which two compounds exchange their positive and negative radicals called double displacement reaction.

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