Question
Question: Gradual addition of potassium iodide solution to aqueous Bi(NO3)3 solution initially produces a dark...
Gradual addition of potassium iodide solution to aqueous Bi(NO3)3 solution initially produces a dark brown precipitate which dissolves in excess of KI to give a clear yellow solution. Identify the yellow precipitate.
A
I2
B
KI3
C
Bi(OH)2
D
Bi (OH)(NO3)2
Answer
I2
Explanation
Solution
The reaction of Bi(NO₃)₃ with KI initially forms BiOI (dark brown precipitate) via hydrolysis. In excess KI, BiOI dissolves to form the soluble complex [BiI₄]⁻, which gives a yellow solution. The question asks for a "yellow precipitate," which is contradictory. Assuming a flawed question, I₂ is the most plausible intended answer among the options, as it relates to iodine chemistry and can precipitate, even though solid I₂ is black.