Question

Which chemical equation is a model of a decomposition reaction?

A. 2Mg + O2 → 2MgO
B. AgNO3 + NaCl → AgCl + NaNO3
C. 3Na + FeBr3 → 3NaBr + Fe
D. 2NaCl → 2Na + Cl2

Answer 1

synthesis reaction

Answer and Explanation:

The chemical reaction 2H2+O2→2H2O 2 H 2 + O 2 → 2 H 2 O is classified as a synthesis reaction.

Answer 2

D. 2NaCl → 2Na + Cl2 is decomposition reaction.

• Decomposition reaction is the reaction where reactant breaks into two or more fragments.
• Reaction with magnesium and oxygen is combination reaction where reactants combine to form one product.
• Reaction involving silver nitrate and sodium chloride is double displacement reaction.
• Reaction involving sodium and iron bromide is single displacement reaction.
• Option D represents breaking of sodium chloride into sodium and chlorine and hence it is a decomposition reaction.