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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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Q. Match each coordination compound in List - I with an appropriate pair of characteristics from List - II and select the correct answer using the code given below the lists.
{en =

H_{2} N C H_{2} C H_{2} N H_{2}

(atomic numbers:

T i = 22; C r = 24; C o = 27; P t = 78

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Q. Find the distance between the following pairs of points:
(i)

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?

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Allotropes of Phosphorus

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