Classify the following reaction: H₂CO₃(aq) → H₂O(l) + CO₂(g)

A) synthesis (or combination)
B) decomposition
C) combustion
D) single displacement (replacement)
E) double displacement (replacement)

H2CO3( AQ) gives H2O + CO2

This reaction is decomposition reaction

Decomposition reaction are those reactions in which reactant is breakdown in a form that it gives two or more than two products

All decomposition reaction are endothermic but all endothermic reactions are not decomposition reaction .

Hence, Option B is the correct answer.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-