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WAEC Chemistry 2011 Paper

Question : 18

Total: 46

Solution:

Concept:

Balancing a chemical equation requires equal numbers of each atom on both sides.

Explanation:

The equation is:

x\mathrm{KMnO_4} + y\mathrm{SO_2} + z\mathrm{H_2O} \rightarrow \mathrm{K_2SO_4} + 2\mathrm{MnSO_4} + 2\mathrm{H_2SO_4}

Balancing potassium atoms:

x = 2

, since there are 2 K atoms on the product side.

Balancing hydrogen atoms:

2z = 4

, so

z = 2

Balancing sulfur atoms:

y = 1 + 2 + 2 = 5

Thus,

x = 2

y = 5

, and

z = 2

Answer:

A. 2, 5 and 2

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