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Nessler's reagent is: 

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a
K2HgI4
b
K2HgI4+KOH
c
K2HgI2+KOH
d
K2HgI4+KI

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detailed solution

Correct option is B

A solution known as Nessler reagent K2Hlg4 is created by mixing sodium hydroxide, potassium iodide, mercuric chloride, and/or mercury iodide.

NH4+H2PtCl6NH42 PtCl6 (Yellow ppt.)

Na3CoNO26 NH43CoNO26(Yellow ppt.)

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