A) \[C{{O}_{3}}\]
B) \[C{{O}_{2}}\]
C) \[NH_{4}^{+}\]
D) \[S{{O}_{4}}\]
Correct Answer: C
Solution :
Nessler's reagent \[{{\text{K}}_{\text{2}}}\text{Hg}{{\text{I}}_{\text{4}}}\]is used to detect the presence of \[\text{NH}_{4}^{+}.\]The given salt is warmed with small amount of NaOH. A gas is given out which gives a brown ppt. on the filter paper dipped in Nessler's reagent kept on its mouth.
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