JAMB Chemistry 2014 Objective — Question 36
Question 36 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2014 Objective paper, with the correct answer and a full explanation.
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A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is A.
- A. Al³⁺Correct
- B. Zn²⁺
- C. Pb²⁺
- D. Ca²⁺
Explanation
In the electrolytic extraction of aluminium from alumina, the cathode is iron, graphite is anode. When NaOH forms a white precipitate insoluble in excess base, presence of Al3+ is confirmed.
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