WAEC Chemistry 2011 Objective — Question 18

Question 18 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

Consider the reaction represented by the following equation: xKMnO4(aq)+ySO2(g)+zH2O(l) → K2SO4(aq)+2MnSO4(aq)+2H2SO4(aq); x, y and z are respectively

A. A. 2, 5 and 2Correct
B. B. 2, 2 and 5
C. C. 5, 1 and 2
D. D. 1, 5 and 2

Explanation

The balanced redox equation between KMnO4 and SO2 is: 2KMnO4(aq)+5SO2(g)+2H2O(l) → K2SO4(aq)+2MnSO4(aq)+2H2SO4(aq). Thus x, y and z are 2, 5 and 2 respectively.

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