CIE iGCSE Co-Ordinated Science C12.5 Identification of ions and gases Exam Style Questions Paper 2
Question
The formula of an ammonium ion is NH$_{4}$$^{+}$.
The formula of a phosphate ion is PO$_{4}$$^{3-}$.
What is the formula of ammonium phosphate?
(A) $(NH_{4})_{3}PO_{4}$
(B) $(NH_{4})_{2}PO_{4}$
(C) $NH_{4}PO_{4}$
(D) $NH_{4}(PO_{4})_{3}$
▶️Answer/Explanation
Ans: A
Question
A student tests an aqueous solution for the presence of sulfate ions.
What is the test and observation for sulfate ions?
(A) Acidify the solution and add aqueous barium ions to produce a white precipitate.
(B) Acidify the solution and add aqueous silver ions to produce a cream precipitate.
(C) Add aqueous iron(III) ions to produce a brown precipitate.
(D) Add aqueous copper(II) ions to produce a pale blue precipitate.
▶️Answer/Explanation
Ans: A
Question
Gas X turns limewater milky.
What is X?
(A) carbon dioxide
(B) chlorine
(C) hydrogen
(D) oxygen
▶️Answer/Explanation
Ans: A
Question
Which metal is used in the test for nitrate ions?
(A) aluminium
(B) copper
(C) magnesium
(D) tin
▶️Answer/Explanation
Ans : A