Answer:
The reaction in which an atom or a set of atoms are displaced by another atom in a molecule is called displacement reaction. For instance, when Iron is added to a copper sulfate solution, it displaces the copper metal.
A + B – C → A – C + B
The above equation exists when A is more reactive than B.
The reaction in which two atoms or a group of atoms are displaced by another atom in a molecule is called a double displacement reaction.
A-B + C-D → A-C + B-D
A and B have to be either:
- Halogens where C indicates a cation.
- Different metals wherein C indicates an anion.
The difference between displacement reaction double displacement reaction is tabulated below:
| Single Displacement reaction | Double displacement reaction |
| In a displacement reaction, a more reactive element replaces a less reactive element from a compound. | In a double displacement reaction, two atoms or a group of atoms switch places to form new compounds. |
| In a displacement reaction, one displacement takes place.
A + BX → AX + B |
In a double displacement reaction, two displacements take place to complete the reaction.
AB + CD → AC + BD |
| Change in color takes place with no precipitate forms. | Precipitate is formed. |
| Metals react with the salt solution of another metal. | Salt solutions of two different metals react with each other. |
| Examples:
2KI + Cl2 → 2KCl + I2 is a displacement reaction. CuSO4 + Zn → ZnSO4 + Cu is also a displacement reaction. |
Examples:
Na2SO4 + BaCl2 → BaSO4 + 2NaCl is a double displacement reaction. 2KBr + BaCl2 → 2KCl + BaBr2 is also a double displacement reaction. |
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