Potassium iodide forms a scarlet precipitate of mercuric iodide when added to mercuric chloride solution. The precipitate of mercuric iodide dissolves in excess of potassium iodide forming a complexA. `K_(2)HgI_(4)`B. `K_(4)HgI_(6)`C. `K_(3)HgI_(3)`D. `KHgI_(2)`

Potassium iodide forms a scarlet precipitate of mercuric iodide when a

1.	Potassium iodide forms a scarlet precipitate of mercuric iodide when added to mercuric chloride solution. The precipitate of mercuric iodide dissolves in excess of potassium iodide forming a complexA. `K_(2)HgI_(4)`B. `K_(4)HgI_(6)`C. `K_(3)HgI_(3)`D. `KHgI_(2)`
Answer» Correct Answer - A Mercuric iodide is obtained as a scarlet prcipitate on addition of postassium iodide to a solution of mercuric chloride. It can also be obtaned by grinding mercury with appropriate amount of iodine. Mercuric iodide, although sparingly soluble in water, dissolves readily in a solution of potassium iodide due to th eformation of iodo complex: `HgCI_(2) + 2KI rarr 2KCI + Hf I_(2)` `HgI_(2) + 2KI rarr K_(2)[Hg I_(4)]` potassium tetraiodo-mercurate (II) The teraiodo complex forms light yellow crystals, `K_(2)[Hg I_(4)]`. `2H_(2)O`, freely soluble in water and alcohol.

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Potassium iodide forms a scarlet precipitate of mercuric iodide when added to mercuric chloride solution. The precipitate of mercuric iodide dissolves in excess of potassium iodide forming a complexA. `K_(2)HgI_(4)`B. `K_(4)HgI_(6)`C. `K_(3)HgI_(3)`D. `KHgI_(2)`

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