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

C) double-replacement and decomposition.

Explanation:

Double replacement reaction or double displacement reaction is defined as a chemical process involving the exchange of bonds between two non-reacting chemical species resulting in the creation of products with bonding affiliations.

Equation of the reaction

Mg(NO3)2 + H2CO3 --> MgCO3 + 2HNO3

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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