Question

two compounds exchange ions to form two new compounds.
single replacement reaction
double replacement reaction
synthesis reaction
decomposition reaction

Explanation:

To solve this, we recall the definitions of chemical reaction types:

• Single replacement: One element replaces another in a compound.
• Double replacement: Two compounds exchange ions (cations and anions swap) to form two new compounds.
• Synthesis: Multiple reactants form one product.
• Decomposition: One reactant breaks into multiple products.

The description matches double replacement reaction.

Answer:

B. Double replacement reaction