Al+MnO−4→Al(OH)−4+MnO2 For this reaction, element X is reduced and element Y is oxidised. Then X and Y are respectively:
AlandMn
AlandAl
MnandAl
MnandMn
A
AlandMn
B
MnandAl
C
AlandAl
D
MnandMn
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Solution
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In the reaction the Al is changing to Al(OH)4− . Its oxidation state is changing from 0 to +3. Increase in oxidation state indicates the element is oxidized,
And MnO4− is converting to MnO2. Its oxidation state is changing from +7 to +4. A decrease in oxidation state indicates the element is reduced.
Thus for this reaction, the element X is Mn which is reduced and the element Y is Al which is oxidized.
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