A salt, when warmed with zinc powder and an NaOH solution, gives a gas that turns a filter paper soaked with an alkaline solution of K2[HgI4] brown. The salt responds to the brown ring test when aceti

Question

A salt, when warmed with zinc powder and an NaOH solution, gives a gas that turns a filter paper soaked with an alkaline solution of K2[HgI4] brown. The salt responds to the brown ring test when acetic acid is used in place of sulphuric acid. The anion present in the salt is:

Prashant Kotian · Accepted Answer

Correct answer: B. The NO2^- ion responds to the brown ring test even with dilute acids like acetic acid. Reduction with Zn/NaOH yields NH3 gas, which turns Nessler's reagent (alkaline K2[HgI4]) brown.

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