Neco 2021 Chemistry Question 44

Practice objective / multiple choice question 44 from the 2021 Neco Chemistry examination.

Neco 2021 Chemistry Objective / Multiple Choice Hard Difficulty

Question 44 NECO • 2021 • CHEMISTRY • objective

A 10.0 mL aqueous solution contains one of the cations Fe^{3+}, Cu^{2+} or Zn^{2+}. The following observations are recorded:\n1. Adding a few drops of dilute HCl produces no precipitate.\n2. Adding excess NH_{4}OH gives a brown precipitate.\n3. Adding a few drops of potassium thiocyanate (KSCN) to the brown precipitate turns the mixture deep blood‑red.\n4. Adding a few drops of potassium ferrocyanide (K_{4}[Fe(CN)_{6}]) to the original solution (before any reagents) produces a blue precipitate.\nIdentify the cation present in the original solution.

A. Cu^{2+}

B. Fe^{2+}

Correct Answer C. Fe^{3+}

D. Zn^{2+}

Correct Answer

Correct Option:

Fe^{3+}

This is Neco 2021 Chemistry Question 44. It is one of the objective questions from the 2021 Neco Chemistry examination.

Difficulty level: Hard .

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