Which is most likely to happen during a precipitation reaction? A. A solid substance will break down into two new substances that
are gases.
B. An insoluble solid will form when ions in dissolved compounds
switch places.
C. A substance will react with oxygen to form water and carbon
dioxide.
D. A gas will form when positive ions switch places to form new
compounds.

I think its B

Explanation:

Precipitation reactions leave a solid behind. The solid is called a precipitate.

B

Explanation:

An insoluble solid will form when ions in dissolved compounds switch places.

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