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Q.

Which of the following statements regarding phosphorus is not true?

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a

Phosphorus belongs to the Group 15 of the periodic table

b

The element phosphorus is obtained by heating the rock phosphate with coke and sand in an electric furnace at about 1700 - 1800 K

c

The formula of phosphorus is P4

d

Black phosphorus is the least stable form of the allotropes of phosphorus

answer is D.

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Detailed Solution

Phosphorus exists in three allotropic forms-white, red and black. Black phosphorus exists in one amorphous and three crystalline forms. Black phosphorus is the most stable form of the element.

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