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(C) The reaction involves the dissolution of a precipitate $(BiI_3)$ by adding an excess of potassium iodide $(KI)$.$BiI_3$ is a black-colored precipi

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$C$. for clear/colourless solution

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(C) The reaction involves the dissolution of a precipitate $(BiI_3)$ by adding an excess of potassium iodide $(KI)$.$BiI_3$ is a black-colored precipitate.When $KI$ is added to $BiI_3$,it forms a soluble complex $K[BiI_4]$.The resulting solution is clear and colored (often yellow/orange due to the complex).Since the reaction converts a precipitate into a clear solution,the correct assignment for the final state is $C$ (clear/colourless solution,though the complex itself may have a color,it is a clear solution compared to the initial suspension).

Assign $A, B, C, D$ from the given type of reaction.
$KI + BiI_3 \downarrow \longrightarrow K[BiI_4]$

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Assign $A, B, C, D$ from the given type of reaction.$KI + BiI_3 \downarrow \longrightarrow K[BiI_4]$