The Nessler's reagent contains

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(D) Nessler's reagent is an alkaline solution of potassium tetraiodomercurate$(II)$,which is prepared by adding potassium iodide to a solution of merc

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$[HgI_4]^{2-}$

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(D) Nessler's reagent is an alkaline solution of potassium tetraiodomercurate$(II)$,which is prepared by adding potassium iodide to a solution of mercury$(II)$ iodide.The chemical reaction is: $HgI_2 + 2KI 	o K_2[HgI_4] ightleftharpoons 2K^+ + [HgI_4]^{2-}$.Thus,the active species in Nessler's reagent is the tetraiodomercurate$(II)$ ion,$[HgI_4]^{2-}$.

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