Question

Which of the following chemical reactions is a decomposition reaction?

2 HgO → 2 Hg + O2


Al + 3 CuCl → AlCl3 + 3 Cu


2 H2 + O2 → 2 H2O


HCl + NaOH → NaCl + H2O

Answer 1

2HgO—»2Hg+O_2

Step-by-step explanation:

The decomposition reaction

• It's reaction in which a single reactant gives two or more than two products

Here Mercury oxide gives mercury and oxygen

so option A is decomposition

Answer 2

2 HgO → 2 Hg + O2

Step-by-step explanation:
Decomposition is when one reactant breaks down into two or more products due to heat, light or electricity
Here mercury (II) oxide goes through thermal decomposition to make mercury and oxygen