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Redox Reactions and Couple

The compound ...

Question

The compound $P_{4} O_{6}$ may be chemically converted into a variety of other species by processes I-III, indicated above. In which of the conversion above is phosphorus reduced?

A

I only

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B

II only

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C

I and III only

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D

II and III only

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E

I, II and III only

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Solution

The correct option is E II only
Decrease in the oxidation state is called reduction.
The oxidation state decreases in II only from +3 to -3.

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