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Question

α-Black phosphorus is formed from:

A
β-Black phosphorus
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B
White phosphorus
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C
Red phosphorus
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D
All of the above
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Solution

The correct option is C Red phosphorus
α-Black phosphorus is produced from red phosphorus when it is heated in a sealed tube at 803 K.
α-Black phosphorus is the most stable allotrope of black phosphorus.

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