p-Block elementsHard

Question

The ion or group detected by K2 [HgI4] is

Options

A.NO
B.Cl-
C.NH2-
D.NH4+

Solution

The ion or group by K2[HgI4] is NH4+. It is known as Hessler′s reagent test.
2K2HgI4NH4 + NH3 = 3KOH → - I + 7KI + 2H2O

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