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WAEC Chemistry 2018 Paper

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Question : 36

Total: 50

The change in the oxidation state of iron in the reaction represented by the equation:

2\mathrm{FeCl}_3 + \mathrm{H_2S} \to 2\mathrm{FeCl}_2 + 2\mathrm{HCl} + \mathrm{S}

is

+2 to +3
0 to +2
+3 to +2
+3 to 0

Solution:

The oxidation number of Iron in $\mathrm{FeCl}_3$ = +3. The oxidation number in $\mathrm{FeCl}_2$ = +2.

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