Neco 2020 Chemistry Question 7
Practice objective / multiple choice question 7 from the 2020 Neco Chemistry examination.
An aqueous solution of an unknown metal salt is subjected to the following qualitative tests:\n(i) Addition of dilute \(\mathrm{HCl}\) produces no visible precipitate.\n(ii) Addition of \(\mathrm{NaOH}\) yields a white precipitate which dissolves on the addition of excess \(\mathrm{NaOH}\).\n(iii) Addition of \(\mathrm{NH_4Cl}\) followed by excess \(\mathrm{NH_4OH}\) produces a deep‑blue solution with no further precipitate.\n(iv) Addition of \(\mathrm{K_2CrO_4}\) gives a yellow precipitate that is insoluble in dilute \(\mathrm{HNO_3}\). Identify all metal cations present in the solution.
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About This Question
This is Neco 2020 Chemistry Question 7. It is one of the objective questions from the 2020 Neco Chemistry examination.
Difficulty level: Hard .
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