Question

The oxidation number of phosphorus in pyrophosphoric acid
is [1999]
(a) +3 (b) +1
(c) +4 (d)

Answer 1

Answer:

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options c is correct

Answer 2

The oxidation number of phosphorous in pyrophosphoric acid is 5.

Explanation:

• Oxidation number is a numeric representation which determines the charge of the particular atom if the compound was ionic compound.

• Here in pyrophosphoric acid, phosphorous acts as the central atom.

• The phosphorous is attached with three oxygen with single bond and with one oxygen in double bond.

• Each oxygen acts as - 1 with single bond and - 2 with double bond.

• So oxidation number of both the phosphorous is +5.

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2. HNO3

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4. K2C2O4

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