Question

types of reactions
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a double replacement reaction can be best described as a reaction in which
a substitution takes place.
two atoms of a compound are lost.
ions are exchanged between two compounds.
electrons are exchanged between two atoms.

Explanation:

A double replacement reaction is defined as a chemical reaction where the positive and negative ions of two ionic compounds swap places, forming new compounds. Substitution is characteristic of single replacement reactions, losing atoms is a decomposition reaction trait, and electron exchange describes redox reactions.

Answer:

ions are exchanged between two compounds.