A decomposition reaction starts with one reactant and ends up with two or more products. Which of the following reactions are decomposition reactions?
NaCl --> Na+ Cl2
H2+02 --> H20
NaOH + HCI--> HOH + NaCl
O H2O --> H2 + O2
O Na + Cl2--> NaCl

2H₂O → 2H₂ + O₂

         2NaCl → 2Na + Cl₂

Explanation:

         2H₂O → 2H₂ + O₂

         2NaCl → 2Na + Cl₂

The reactions shown above is a decomposition.

In a decomposition reaction or cracking, two or more products are formed from a single product.

The breakdown of a compound into its components as individual elements or other compounds falls into this category of reactions.

Cracking is a sort of decomposition reactions that is used in petroleum industries to sort the fractions of a compound.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).