Write a balanced chemical reaction where the natural mixing of two colorless aqueous solutions produces a yellow precipitate.

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Solution

Precipitation reaction:
A precipitate is an insoluble solid which is obtained by the process of a precipitation reaction.
A precipitation reaction is a reaction that takes place in an aqueous solution in which cations and anions are combined to form an insoluble solid which is termed a precipitate.
Few examples of a precipitation reaction:
1 $\underset{(C o p p e r s u p h a t e)}{\underset{⏟}{C u S O_{4} (a q)}} + \underset{(S o d i u m h y d r o x i d e)}{\underset{⏟}{2 N a O H (a q)}} \to \underset{(S o d i u m s u l p h a t e)}{\underset{⏟}{N a_{2} S O_{4} (s)}} + \underset{\underset{P r e c i p i t a t e}{\underset{⏟}{(C o p p e r h y d r o x i d e)}}}{\underset{⏟}{C u {(O H)}_{2}}} ↓$
2. $\underset{(L e a d n i t r a t e)}{\underset{⏟}{P b {(N O_{3})}_{2} (a q)}} + \underset{(S o d i u m I o d i d e)}{\underset{⏟}{2 N a I (a q)}} \to \underset{\underset{(P r e c i p i t a t e)}{\underset{⏟}{(L e a d i o d i d e)}}}{\underset{⏟}{P b I_{2} (s)}} ↓ + \underset{(S o d i u m n i t r a t e)}{\underset{⏟}{2 N a N O_{3} (a q)}}$
Few yellow precipitates are:
Lead iodide $(P b I_{2})$ , Silver bromide $(A g B r)$ , Cadmium sulphide $(C d S)$ .
The chemical reaction in which the mixing of two colorless aqueous solutions produces a yellow precipitate is as follows:
$\underset{(L e a d n i t r a t e)}{\underset{⏟}{P b {(N O_{3})}_{2} (a q)}} + \underset{(P o t a s s i u m i o d i d e)}{\underset{⏟}{2 K I (a q)}} \to \underset{\underset{(Y e l l o w P r e c i p i t a t e)}{\underset{⏟}{(L e a d I o d i d e)}}}{\underset{⏟}{P b I_{2} (s)}} + \underset{(P o t a s s i u m n i t r a t e)}{\underset{⏟}{K N O_{3} (a q)}}$
Here $(P b I_{2})$ is a yellow-colored precipitate.

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