The 2 decomposition reactions are:
B. [tex]K_{2}[/tex][tex]CO_{3}[/tex] (s) --> [tex]K_{2} O[/tex] (s) + [tex]CO_{2}[/tex] (g)
C. [tex]2SO_{3}[/tex] (g) --> [tex]2SO_{2}[/tex] (g) + [tex]O_{2}[/tex] (g)
Explanation:
Step 1:
A decomposition reaction is one in which a single compound breaks down into two or more products.
Step 2:
Let us examine each reaction if it satisfies the above rule.
A. 2 LiOH + [tex]CO_{2}[/tex] ---> [tex]Li_{2} CO_{3}[/tex] + [tex]H_{2} O[/tex]
In this reaction we have 2 reactants giving 2 products. Hence this is not a decomposition reaction.
B. [tex]K_{2} CO_{3}[/tex] ---> [tex]K_{2} O[/tex] + [tex]CO_{2}[/tex]
In this reaction a single reactant potassium carbonate gives rise to 2 products Potassium Oxide and carbon-di-oxide. Hence this is a decomposition reaction
C. [tex]2SO_{3}[/tex] ---> [tex]2SO_{2}[/tex] + [tex]O_{2}[/tex]
In this reaction a single reactant sulfur tri-oxide gives rise to 2 products sulfur di-oxide and oxygen. Hence this is a decomposition reaction.
D. [tex]2Na[/tex] + [tex]Cl_{2}[/tex] ---> [tex]2NaCl_{}[/tex]
In this reaction 2 reactants sodium and chlorine gives rise to a single product sodium chloride. Hence this is not a decomposition reaction.
Step 3:
Answer:
The 2 decomposition reactions are:
B. [tex]K_{2} CO_{3}[/tex] (s) ---> [tex]K_{2}O[/tex] (s) + [tex]CO_{2}[/tex] (g)
C. [tex]2SO_{3}[/tex] ---> [tex]2SO_{2}[/tex] + [tex]O_{2}[/tex]
