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. Step 1: Identify the colors of each compound in the options. Step 2: Lead chromate (PbCrO4), arsenic(III) sulfide (As2S3), and tin(IV) sulfide (SnS2) are well-known compounds that form yellow precipitates. Step 3: In contrast, Sb2S3 is orange-red and PbO is usually yellow-to-reddish, but the set in option (c) strictly consists entirely of yellow precipitates: PbCrO4 (yellow), As2S3 (yellow), and SnS2 (yellow). This matches option (c).

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