Which is the most stable allotrope of sulphur?

Octahedral sulphur

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Monoclinic sulphur

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Plastic sulphur

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Colloidal sulphur

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Solution

The correct option is A Octahedral sulphur
Sulphur mainly exists in two allotropic forms: Rhombic and Monoclinic.

Out of these, rhombic allotrope (yellow in color) of sulphur is the most stable allotrope of sulphur. Rhombic sulphur is also called octahedral sulphur.

Hence, option (a) is correct.

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