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CIE iGCSE Co-Ordinated Science C6.3 Redox Exam Style Questions Paper 1

CIE iGCSE Co-Ordinated Science C6.3 Redox Exam Style Questions Paper 1

Question

Which reaction is not a redox reaction?

A    iron oxide + carbon iron + carbon dioxide

  silver nitrate + sodium chloride silver chloride + sodium nitrate

C    copper oxide + hydrogen copper + water

D    magnesium + oxygen magnesium oxide

▶️Answer/Explanation

Ans :A

Question

Which word equation represents a redox reaction?
A calcium carbonate → calcium oxide + carbon dioxide
B calcium oxide + hydrochloric acid → calcium chloride + water
C copper oxide + carbon → copper + carbon dioxide
D sodium oxide + water → sodium hydroxide

▶️Answer/Explanation

Ans : C

Question

Which statement shows that methane, CH4, is oxidised when it burns?
(A) The products of the reaction are gaseous.
(B) The products of the reaction are water and carbon dioxide.
(C) The reaction is exothermic.
(D) The total number of oxygen atoms has increased during the reaction.

▶️Answer/Explanation

Ans : B

Question

In which change is the oxide of phosphorus, P2O3, reduced?

▶️Answer/Explanation

Ans: A

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