Question

When magnesium carbonate, MgCO2, reacts with nitric acid, HNO3, it forms magnesium nitrate, Mg(NO3)2, and carbonic acid, H2CO3. Carbonic acid then breaks down into water and carbon dioxide. Which two types of reactions take place in this process?

A.) synthesis and decomposition
B.) single-replacement and combustion
C.) double-replacement and decomposition
D.) double-replacement and combustion

Answer 1

Answer: C.) double-replacement and decomposition

Explanation:

`MgCO_3+2HNO_3\rightarrow Mg(NO_3)_2+H_2CO_3`: is a double displacement reaction in which ion exchange takes place.

`H_2CO_3\rightarrow H_2O+CO_2`

is a decomposition reaction as one reactant breaks down to give two or more than two products.

Synthesis reaction involve two or more than two reactants to give single product.

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.

Combustion involves reaction of hydrocarbon with oxygen to form carbon dioxide and water.

Answer 2

I think the correct answer among the choices listed above is option C. The two type of reaction taking place in the process are double-replacement reaction and decomposition reaction. The double-replacement reaction is the reaction between magnesium carbonate and nitric acid while the decomposition is the breaking down of the carbonic acid into water and CO2.