Question

A student learns that some products are formed as a result of combining two
compounds while some compounds are formed as a result of dissociation of
two compounds. The image shows two reactions.
(refer to the picture)
Which reaction is an example of a combination reaction and a decomposition
reaction?
(a) both the reactions are examples of combination reaction
(b) both the reactions are examples of a decomposition reaction
(c) reaction P is an example of a combination reaction while reaction Q is an
example of a decomposition reaction
(d) P is an example of a decomposition reaction while reaction Q is an example
of a combination reaction

Answer 1

Answer:

C. Reaction P- Combination reaction.

Reaction Q- Decomposition reaction.

Answer 2

The correct option is- (c) reaction P is an example of a combination reaction while reaction Q is an example of a decomposition reaction.

Reaction P

• It shows a combination reaction in which two reactants are combined to form a single product. In reaction P, calcium oxide and sulphur dioxide combine to form a product calcium sulphite.

Reaction Q

• It shows a dissociation reaction in which a single reactant breaks into two or more products. Here, zinc carbonate dissociates to form two products zinc oxide and carbon dioxide.