The stable allotropic form of sulphur at room temperature is:
A
Rhombic sulphur
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B
Monoclinic sulphur
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C
Plastic sulphur
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D
β− sulphur
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Solution
The correct option is A Rhombic sulphur The stable form at room temperature is rhombic sulphur, which transforms to monoclinic sulphur when heated above 369 K.