Neco 2020 Chemistry Question 9

Practice objective / multiple choice question 9 from the 2020 Neco Chemistry examination.

Neco 2020 Chemistry Objective / Multiple Choice Hard Difficulty
Question 9 NECO • 2020 • CHEMISTRY • objective

An unknown aqueous solution contains a single anion. The following observations are recorded:\n1. Adding dilute \(\mathrm{HCl}\) produces effervescence of a colourless gas.\n2. Adding \(\mathrm{BaCl_2}\) gives a white precipitate that does not dissolve in excess \(\mathrm{NH_4Cl}\).\n3. Adding \(\mathrm{AgNO_3}\) yields a white precipitate that is soluble in dilute \(\mathrm{NH_3}\). Identify the anion.

Answer Options

Correct Answer A. carbonate ion (\(\mathrm{CO_3^{2-}}\))
B. phosphate ion (\(\mathrm{PO_4^{3-}}\))
C. sulfate ion (\(\mathrm{SO_4^{2-}}\))
D. chloride ion (\(\mathrm{Cl^-}\))
Correct Answer
A
Correct Option:
carbonate ion (\(\mathrm{CO_3^{2-}}\))

About This Question

This is Neco 2020 Chemistry Question 9. It is one of the objective questions from the 2020 Neco Chemistry examination.

Difficulty level: Hard .

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