How can the relationship between synthesis and decomposition reactions be described?

Question

Synthesis reactions happen when substances combine to make a new substance. Decomposition reactions occur when a substance breaks apart to make new substances. Thus, the reactions are the reverse of one another.
Decomposition reactions involve one ion replacing another.

Synthesis reactions involve two ions swapping places. Thus, the reactions both involve the movement of ions.

Decomposition reactions happen when substances combine to make a new substance. Synthesis reactions occur when a substance breaks apart to make new substances. Thus, the reactions are the reverse of one another.

Synthesis reactions involve one ion replacing another. Decomposition reactions involve two ions swapping places. Thus, the reactions both involve the movement of ions.

Answer 1

Wouldn't it be logical to look up the definition of each? Then you will have the information you need to answer the question.