Home / iGCSE Chemistry Multiple Choice (Extended) : 12.5 Identification of ions and gases: Exam Style Questions Paper 2

iGCSE Chemistry Multiple Choice (Extended) : 12.5 Identification of ions and gases: Exam Style Questions Paper 2

Question

 Which statements about lime are correct?
               1         Lime is made by heating calcium carbonate (limestone).
               2         Lime is used to desulfurise flue gases.
               3         Lime is used to treat alkaline soil.
               4         The chemical name for lime is calcium oxide.

A. 1 and 3               B. 1, 2 and 4                 C. 1 and 4 only                D. 2, 3 and 4

Answer/Explanation

Ans:

B

Question

When aqueous sodium hydroxide is added to a solution of a metal ion, a grey-green precipitate
forms, which dissolves in excess to form a dark green solution.
What is the identity of the metal ion?
A chromium(III)
B iron(II)
C iron(III)
D copper(II)

Answer/Explanation

Ans: A

Question

 Sodium nitrate is a white crystalline solid that decomposes on heating.

Which row describes the decomposition products formed when sodium nitrate is heated strongly?

▶️Answer/Explanation

Ans:B

Question

 The equation for a reaction occurring in the Contact process is shown.
\(2SO_{2}+O_{2}\rightarrow 2SO_{3}\)
What is the catalyst used in this reaction?

A. iron
B. phosphoric(V) acid
C. sulfuric acid
D. vanadium(V) oxide

Answer/Explanation

Ans:

D

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