Neco 2021 Chemistry Question 36

Practice objective / multiple choice question 36 from the 2021 Neco Chemistry examination.

Neco 2021 Chemistry Objective / Multiple Choice Hard Difficulty

Question 36 NECO • 2021 • CHEMISTRY • objective

An aqueous solution contains a single metal cation selected from \(Fe^{3+}\), \(Al^{3+}\). The following observations are recorded: (i) Adding excess NaOH to the solution produces a brown precipitate which dissolves on further addition of NaOH, giving a clear solution. (ii) Adding NH4Cl followed by NH4OH (without prior NaOH) yields a white gelatinous precipitate that does not dissolve on further addition of NH4OH. (iii) Adding potassium thiocyanate (KSCN) to the solution after step (ii) produces a deep red colour. Identify the cation present.

A. Mn^{3+}

B. Cr^{3+}

Correct Answer C. Fe^{3+}

D. Al^{3+}

Correct Answer

Correct Option:

Fe^{3+}

This is Neco 2021 Chemistry Question 36. It is one of the objective questions from the 2021 Neco Chemistry examination.

Difficulty level: Hard .

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