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Chemical Properties of Ammonia

The reddish b...

Question

The reddish brown precipitate formed in (a) reaction is of:

A

mercury amido iodide

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B

mercury iodide

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C

oxydimercuric ammonium iodide

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D

mercury amido iodide and mercury

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Solution

The correct option is C oxydimercuric ammonium iodide
Zero group reagent is ammonia .On passing the gas through alkaline solution of potassium tetraiodomercurate (II)(Nesslers reagent), a brown colouration or precipitate of basic mercury(II) amido-iodine is formed.
$2 K_{2} (H g I_{4}) + N H_{3} + 3 K O H \to H g O H g N H_{2} I + 7 K I + 2 H_{2} O$

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[1 mark]

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