Question

what is displacement reaction? give one example with diagram?

Answer 1

when high reactive element displace least reactive element.
hight to low reactive element are
k
Na
c
mg
al
zn
fe
pb
H
cu
hg
au
pt
example : when potassium (K) reacts with water (H2O). A colorless solid compound named potassium hydroxide (KOH) forms, and hydrogen gas (H2) is set 

Answer 2

The reaction in which two different atoms or group of atoms are displaced by other atoms or groups of atoms or in which two compound react by an exchange .
OR
Displacement of Ions to form New compounds are called double displacement reaction.



Eg.. See in the diagram