Answer:
Displacement reaction
When an atom or group of atoms in a molecule is replaced by another atom or group of atoms, such chemical reaction is called displacement reaction. Displacement reaction is of two types. They are:
- Single displacement reaction
- Double displacement reaction
Single displacement reaction
When an atom in a molecule is replaced by another atom, such chemical reaction is called single displacement reaction.
For example:
Zinc + Hydrochloric acid → Zinc Chloride + Hydrogen
Zn + 2HCI → ZnCI₂ + H₂
Here, Zn is more reactive than H₂. So, Zn displaces H from the compound HCI.
Double displacement reaction
A chemical reaction in which the molecules of the reactants get decomposed and exchange their corresponding ions to give new products is called a double displacement reaction.
For example:
AgNO₃ + NaCI → NaNO₃ + AgCI
Hope this helps..
Best regards!!