CIE iGCSE Co-Ordinated Science C10.1 Water Exam Style Questions Paper 2
Question
Cobalt (II) chloride, cobalt (II) nitrate, and cobalt (II) sulfate are soluble in water.
Cobalt (II) oxide and cobalt (II) carbonate are insoluble in water.
Which method can be used to prepare a sample of solid cobalt (II) sulfate?
(A) Mix aqueous sodium sulfate and aqueous cobalt (II) nitrate, then filter.
(B) Mix excess aqueous sulfuric acid and aqueous cobalt (II) chloride, then filter and evaporate the filtrate.
(C) Mix dilute sulfuric acid and an excess of cobalt (II) oxide, then distil.
(D) Mix dilute sulfuric acid and an excess of cobalt (II) carbonate, then filter and evaporate the filtrate.
▶️Answer/Explanation
Ans : D
Question
In a test for water, water turns anhydrous copper(II) ……1…… from ……2…… to ……3…… .
Which words complete gaps 1, 2 and 3?
▶️Answer/Explanation
Ans: D
Question
Copper(II) sulfate and cobalt(II) chloride are used to test for water.
Which rows show the colour changes for these two substances?
(A) 1 and 2 (B) 1 and 4 (C) 2 and 3 (D) 3 and 4
▶️Answer/Explanation
Ans: B
Question
What is not a use of limestone?
(A) manufacture of calcium oxide
(B) neutralising industrial waste products
(C) purifying water
(D) treating acidic soil
▶️Answer/Explanation
Ans: C