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  4. K2HgI4 is used to test the following:

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Q. $ {{K}_{2}}Hg{{I}_{4}} $ is used to test the following:

MGIMS WardhaMGIMS Wardha 2005

Solution:

In the identification of $ NH_{4}^{+} $ ion neseller reagent $ {{K}_{2}}Hg{{I}_{4}} $ is used with which it give brown precipitate.