Question

some example of combination reaction, decomposition reaction, displacement reaction , and double displacement reaction in long form and equation form....plzz very urgent

Answer 1

In combination reactions, two or more reactants form one product.
The reaction of sodium and chlorine to form sodium chloride,
2Na+Cl2 > 2NaCl


In decomposition reactions, a single compound breaks down into two or more simpler substances.

The decomposition of water into hydrogen and oxygen gases,

2H2O > 2H2 +O2

In single displacement reactions, a more active element displaces another less active element from a compound.
For example, if you put a piece of zinc metal into a copper(II) sulfate solution, the zinc displaces the copper
Zn +CuSO4> ZnSO4 +Cu


 In double displacement reactions, two species (normally ions) are displaced
KCl +AgNO3 > AgCl +KNO3