Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?

Yellow phosphorous

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α

-Black phosphorus

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β

-Black phosphorus

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White phosphorus

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Solution

The correct option is B $α$ -Black phosphorus
Black phosphorus has two forms : $α$ -black and $β$ -black.

$α$ -black phosphorus is formed when red phosphrus is heated in a sealed tube at $803 K$

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Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?

The correct option is B α-Black phosphorusBlack phosphorus has two forms : α-black and β-black. α-black phosphorus is formed when red phosphrus is heated in a sealed tube at 803 K

The correct option is B $α$ -Black phosphorus
Black phosphorus has two forms : $α$ -black and $β$ -black.

$α$ -black phosphorus is formed when red phosphrus is heated in a sealed tube at $803 K$