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Allotropes of Phosphorus

Phosphorus no...

Question

Phosphorus normally exhibits a covalency of :

A

+ 3

and

+ 5

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B

+ 2

and

+ 3

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C

+ 1

and

+ 2

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D

+ 3

and

+ 4

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Solution

The correct option is A $+ 3$ and $+ 5$
Phosphorous acid $H_{3} {P O}_{3}$ , metaphosphorous acid $H P O_{2}$ has $+ 3$ oxidation state.
Pyrophosphoric acid $H_{4} P_{2} O_{7}$ , orthophosphoric acid $H_{3} {P O}_{4}$ has $+ 5$ oxidation state.

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{en =

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(atomic numbers:

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