A metal nitrate reacts with KI solution ...

A metal nitrate reacts with KI solution to give a block precipitate which on addition of excess of KI solution forms an orange coloured solution. The cation of metal nitrate is :

`Hg^(2+)`

`Bi^(3+)`

`Pb^(2+)`

`Cu^(2+)`

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To determine the cation of the metal nitrate that reacts with KI solution to produce a black precipitate, which then forms an orange-colored solution upon the addition of excess KI, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Reaction**: - When a metal nitrate reacts with potassium iodide (KI), it can form a precipitate. The problem states that a black precipitate is formed initially. 2. **Consider Possible Cations**: - The cation that is known to form a black precipitate with iodide ions (I-) is bismuth (Bi). 3. **Write the Reaction for Bismuth**: - The reaction can be represented as: \[ \text{Bi}^{3+} + 3 \text{KI} \rightarrow \text{BiI}_3 \text{ (black precipitate)} + 3 \text{K}^+ \] - Here, BiI3 is the black precipitate formed. 4. **Excess KI Addition**: - When excess KI is added to the reaction mixture, the black precipitate can further react to form a complex ion: \[ \text{BiI}_3 + 2 \text{KI} \rightarrow \text{K}_3\text{BiI}_4 \text{ (orange solution)} \] - This reaction results in the formation of an orange-colored solution, confirming the presence of bismuth. 5. **Conclusion**: - Based on the reactions, the cation of the metal nitrate is determined to be bismuth (Bi). ### Final Answer: The cation of the metal nitrate is **Bismuth (Bi)**. ---

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