Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions. Example : Reaction of iron nails with copper sulphate solution.

Desplasmate of metal is chemical change. In this reaction more reactive metal is placed on less reactive metal.

Displacement reactions, also known as redox reactions, occur when a more reactive metal displaces a less reactive metal from its compound. These reactions are a common occurrence in metals and can be demonstrated through various activities. Here is an explanation of an activity that can be conducted to show displacement reactions in metals.

**Activity: Copper Displacement Reaction with Silver Nitrate**

**Materials Needed:**
1. Copper wire
2. Silver nitrate solution
3. Beaker or test tube
4. Distilled water
5. Dropper or stirring rod

**Procedure:**
1. Take a small piece of copper wire and clean it using sandpaper or a wire brush to remove any oxide or impurities.
2. Fill a beaker or test tube with a small amount of silver nitrate solution.
3. Add a few drops of distilled water to dilute the solution.
4. Place the cleaned copper wire into the silver nitrate solution.
5. Observe the reaction and record your observations.

**Explanation:**
In this activity, copper displaces silver from its compound, silver nitrate. This is because copper is more reactive than silver. The following reaction takes place:

Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)

**Observations:**
1. Initially, the silver nitrate solution is transparent.
2. As the copper wire is placed into the solution, a reddish-brown coating starts to form on the wire.
3. Over time, the reddish-brown coating becomes more prominent, indicating the formation of copper nitrate.
4. Silver metal particles can be observed precipitating out of the solution and settling at the bottom of the beaker or test tube.

**Explanation of Observations:**
The reddish-brown coating on the copper wire is formed due to the deposition of copper metal. This indicates that copper has displaced silver from the silver nitrate solution. The silver metal particles formed are evidence of the displacement reaction. The transparent silver nitrate solution turns into a blue-colored copper nitrate solution.

**Conclusion:**
This activity clearly demonstrates a displacement reaction in metals. The more reactive metal, copper, displaces the less reactive metal, silver, from its compound, silver nitrate. This activity helps students understand the reactivity series of metals and the concept of displacement reactions.