Question

Which reaction is an example of a precipitation reaction?

Answer 1

Answer: Option (A) is the correct answer.

Explanation:

When two aqueous solutions chemically combine together then there is a possibility that an insoluble solid substance might form. This insoluble substance is known as a precipitate and this type of reaction is known as precipitation reaction.

For example, $FeCl_{3}(aq) + 3KOH(aq) \rightarrow Fe(OH)_{3}(s) + 3KCl(aq)$

Here, $Fe(OH)_{3}(s)$ is the precipitate.

Thus, we can conclude that out of the given options, the reaction $FeCl_{3}(aq) + 3KOH(aq) \rightarrow Fe(OH)_{3}(s) + 3KCl(aq)$ is an example of a precipitation reaction.

Answer 2

Answer:

(A) FeCl3 (aq) + 3 KOH (aq) → Fe(OH)3 (s) + 3 KCl (aq)

Explanation:

A precipitation reaction happens when a solid (called a precipitate) is formed due the reaction between anions and cations that were previously in aqueous solution.

In B there were no cations or anions that interacted

In C, and D, cations and anions interacted but no solid (precipitate was formed)

In E the cations interacted with a solid and no precipitate was formed.