Question

what is double displacement and displacement reaction​

Answer 1

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A double displacement reaction, also known as a double replacement reaction or metathesis, is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.

A displacement reaction is a reaction in which an atom, or a group of atoms, present in a molecule is displaced by another atom. For example, iron when added to a solution of copper sulphate displaces copper metal.
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Answer 2

$\bold{Double\: Displacement \: Reaction \: :}$

In this type of reaction; exchange of ions takes place between compounds to produce new compounds.

i.e.

AB + CD → CB + AD

Example :

1) $AgNO_{3}$ + $NaCl$ → $AgCl$ + $NaNO_{3}$

2) $Na_{2}SO_{4}$ + $BaCl_{2}$ → $BaSO_{4}$ + $2NaCl$

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$\bold{ Displacement \: Reaction \: :}$

In this type of reaction; more reactive element displaces less reactive element from it's compound.

i.e.

A + BC → AC + B

Example :

1) $Mg$ + $CuSO_{4}$ → $Cu$ + $MgSO_{4}$

2) $Zn$ + $CuSO_{4}$ → $Cu$ + $ZnSO_{4}$

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