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Question

Of the given 3 allotropes of Phosphorus – white, red and black, which is the most stable thermodynamically?

A
Black Phosphorus
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B
White Phosphorus
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C
Red Phosphorus
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D
Both a and c
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Solution

The correct option is A Black Phosphorus

β-black Phosphorus is obtained by heating white Phosphorus in an inert atmosphere at very high pressures (4000-12000 atm) at about 473 K

β -black Phosphorus looks like

and is a good conductor of electricity. Black Phosphorus is regarded as the thermodynamically most stable allotrope and is also the least reactive!

α- black phosphorus is made by heating red P in a sealed tube at 453 K in an inert atmosphere. Neither white nor red Phosphorus are good conductors of electricity.

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