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  4. Nessler's reagent is used in testing for ammonia, with which it forms a brown coloration or precipitate. The count of iodine atoms in one unit is

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Q. Nessler's reagent is used in testing for ammonia, with which it forms a brown coloration or precipitate. The count of iodine atoms in one unit is

NTA AbhyasNTA Abhyas 2022

Solution:

The chemical formula of Nessler's reagent is $K_{2}HgI_{4}$ . Hence, there are $4$ iodine atoms in it.