Question

what is displacement reaction please explain i have exam tommorrow

Answer 1

Displacement reaction is a chemical reaction in which a more reactive metal displaces a less reactive metal from its salt solution.
Eg :- if we take dilute copper sulphate solution (blue in colour) and place an iron nail in it and stir the solution... After a few minutes the nail becomes red-brown. This is because a layer of copper gets deposited over the surface of the nail.
The colour of solution slowly changes from blue to green due to the formation of iron sulphate ......
This activity shows that iron displaces copper from copper sulphate solution

Answer 2

$\boxed{Answer}$

$\textbf{Displacement Reaction}$ :-

= In which more reactive element displaces less reactive element from it's compound. Such types of reaction is known as Displacement Reaction.

i.e.

AB + C ----› AC + B

Ex :- 2Al (s) + 3CuCl2 (aq) ----› 2AlCl3 (aq) + 3Cu (s)
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According to Reactivity Series i.e.

K = Potassium (Most reactive)

Na = Sodium

Ca = Calcium

Mg = Magnesium

Al = Aluminum

Zn = Zinc

Fe = Iron

Pb = Lead

H = Hydrogen

Cu = Copper

Ag = Silver

Au = Gold (Least Reactive)

We can say that Aluminum is more reactive than Copper as reactivity decreases down the group. So, that why it displaces Copper from Copper Chloride and then combine with Aluminum to form Aluminum Chloride.
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