JEE Main 2017 Chemistry question
A solution containing a period-IV cation gives a precipitate on passing . A solution of this precipitate in dil. HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is:
Answer: (2)
Solution
Follow the colours, which are the decisive clue. **Sulphide:** all four cations give sulphides, but only is **white**; MnS is buff/flesh-coloured, while NiS and CoS are black. **With NaOH:** the solution gives a **white** precipitate, which is — is white but
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