Neco 2018 Chemistry Question 26

Practice objective / multiple choice question 26 from the 2018 Neco Chemistry examination.

Neco 2018 Chemistry Objective / Multiple Choice Hard Difficulty

Question 26 NECO • 2018 • CHEMISTRY • objective

An unknown inorganic salt solution is subjected to the following qualitative tests:\n\n(i) Flame test produces a green colour.\n\n(ii) Addition of dilute NaOH gives a blue precipitate which dissolves on adding excess NaOH to give a colourless solution.\n\n(iii) Subsequent addition of aqueous NH\(_3\) to the solution after step (ii) yields a deep blue solution.\n\n(iv) Addition of potassium ferrocyanide solution, K\(_4\)[Fe(CN)\(_6\)], results in a dark brown precipitate.\n\nBased on these observations, identify the metal ion(s) present in the original solution.

A. Cu^{+}, Fe^{3+}

Correct Answer B. Cu^{2+}, Fe^{3+}

C. Cu^{2+}, Fe^{2+}

D. Ni^{2+}, Fe^{3+}

Correct Answer

Correct Option:

Cu^{2+}, Fe^{3+}

This is Neco 2018 Chemistry Question 26. It is one of the objective questions from the 2018 Neco Chemistry examination.

Difficulty level: Hard .

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