Neco 2018 Chemistry Question 45
Practice objective / multiple choice question 45 from the 2018 Neco Chemistry examination.
An aqueous solution contains a single metal cation selected from Fe³⁺, Al³⁺, Cr³⁺ or Mn²⁺. The following observations are made:\n1. Adding dilute HCl produces no precipitate.\n2. Adding NaOH gives a brown precipitate that is insoluble in excess NaOH.\n3. Adding ammonium hydroxide to the solution after the NaOH test yields the same brown precipitate, which remains insoluble in excess NH₄OH.\n4. After acidifying a fresh portion of the solution, addition of potassium ferrocyanide, \(\mathrm{K_4[Fe(CN)_6]}\), produces a deep blue precipitate. Identify the metal cation present in the original solution.
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About This Question
This is Neco 2018 Chemistry Question 45. It is one of the objective questions from the 2018 Neco Chemistry examination.
Difficulty level: Hard .
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