Neco 2024 Chemistry Question 21

Practice objective / multiple choice question 21 from the 2024 Neco Chemistry examination.

Neco 2024 Chemistry Objective / Multiple Choice Hard Difficulty

Question 21 NECO • 2024 • CHEMISTRY • objective

An aqueous sample contains an unknown metal ion. The following observations are made sequentially: (i) Addition of dilute \\(\\mathrm{HCl}\\) produces no precipitate. (ii) Addition of excess \\(\\mathrm{NH_4OH}\\) yields a blue precipitate that dissolves on further addition of \\(\\mathrm{NH_4OH}\\). (iii) Passing \\(\\mathrm{H_2S}\\) gas through the solution acidified with \\(\\mathrm{HCl}\\) gives a black precipitate which does not dissolve in dilute \\(\\mathrm{HCl}\\). (iv) A flame test shows a green colour. Identify the metal ion present.

A. Fe^{2+}

B. Zn^{2+}

Correct Answer C. Cu^{2+}

D. Ni^{2+}

Correct Answer

Correct Option:

Cu^{2+}

This is Neco 2024 Chemistry Question 21. It is one of the objective questions from the 2024 Neco Chemistry examination.

Difficulty level: Hard .

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support