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Question

In which of the following oxidation state of phosphorus is +3?

A
Orthophosphoric acid
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B
Pyrophosphoric acid
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C
Metaphosphoric acid
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D
Orthophosphorous acid
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Solution

The correct option is D Orthophosphorous acid
Oxidation state of hydrogen = +1
Oxidation state of oxygen = −2

In Orthophosphoric acid (H3PO4), phosphorus has the oxidation state of +5.
In Orthophosphorus acid (H3PO3), phosphorus has the oxidation state of +3.
In metaphosphoric acid (HPO3), phosphorus has the oxidation state of +5.
In pyrophosphoric acid (H4P2O7), phosphorus has the oxidation state of +5.

Hence, option (c) is correct.

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