CIE iGCSE Co-Ordinated Science C7.3 Preparation of salts Exam Style Questions Paper 1
Question
Magnesium chloride is prepared by reacting an excess of insoluble magnesium oxide with dilute
hydrochloric acid.
Which processes are used to obtain pure crystals of magnesium chloride from the reaction
mixture?
1 distillation
2 evaporation
3 filtration
(A) 1 followed by 2
(B) 3 followed by 2
(C) 3 followed by 1
(D) 1 followed by 3, followed by 2
▶️Answer/Explanation
Ans : B
Question
Which word equation describes the manufacture of lime from limestone?
(A) calcium carbonate → calcium hydroxide + carbon dioxide
(B) calcium carbonate → calcium oxide + carbon dioxide
(C) calcium hydroxide → calcium oxide + water
(D) calcium oxide + carbon dioxide → calcium carbonate
▶️Answer/Explanation
Ans: B
Question
Solid S is added to dilute hydrochloric acid in the apparatus shown.
▶️Answer/Explanation
Ans: B
Question
Salts are made when four substances react separately with dilute hydrochloric acid.
1. magnesium
2. magnesium carbonate
3. magnesium hydroxide
4. magnesium oxide
Which substances produce a gas when reacted with dilute hydrochloric acid?
(A) 1 and 2 (B) 1 and 3 (C) 2 and 4 (D) 3 and 4
▶️Answer/Explanation
Ans: A