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During the preparation of aluminium sulphide, Al2S3 what is the reaction rate at which aluminium and sulphur react together at 800^oC?

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During the preparation of aluminium sulphide, Al2S3 what is the reaction rate at which aluminium and sulphur react together at 800^oC?

(a) React very slowly

(b) React rapidly

(c) Reacts and reaches equilibrium

(d) Doesn’t react

This question was posed to me in quiz.

My doubt is from Crystallization of Solutions, Melts, Glasses and Gels in portion Preparative Methods of Solid State Chemistry

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Best answer
Correct option is (a) React very slowly

Best explanation: Aluminium and sulphur react very slowly during the preparation of aluminium sulphide since liquid Al becomes coated with a skin of Al2S3, which acts as a diffusion barrier to further reaction.

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