Give reason : Double displacement reaction takes place only in aqueous medium.

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Solution

A double displacement reaction takes place only in an aqueous medium, because,
Generally in a double displacement reaction, two salts mutually exchange their ions.
In a solid state due to a strong ionic force of attraction, the exchange of ions does not occur. hence, the double displacement reaction cannot take place.
In an aqueous solution, the ions are free to move and get separated easily, so the reaction can take place easily.
Double displacement reaction
Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.
In double replacement reactions, the positive ions exchange negative ion partners.
Many double displacement reactions occur between ionic compounds that are dissolved in water.
It is generally represented as $A - B + C - D ⟶ A - D + C - B$
For example neutralization reactions, precipitation reactions, etc
Application of double displacement reaction is acid indigestion, extraction of metals, and flame photometry.

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