Of the three varieties of cyclo-octasulphur polymorphs - the alpha, beta and gamma forms, the most stable polymorph near room temperature is

alpha

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beta

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gamma

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Solution

The correct option is A alpha
Of the three polymorphs, the $α$ -Sulphur or the rhombic Sulphur is the most stable (below ${95.3}^{\circ} C$ ) and also the most common one. The $β$ -Sulphur or monoclinic Sulphur is stable only above ${95.3}^{\circ} C$ . At temperatures above ${95.3}^{\circ} C$ $α$ -Sulphur turns into $β$ -Sulphur. The $γ$ -Sulphur is the densest of the three $S_{8}$ polymorphs. It can be prepared by slowly cooling molten Sulphur that has been heated above $150^{\circ} C$

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