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A is a binary compound of a univalent me...

A is a binary compound of a univalent metal. When 1.422 g of A reacts completely with 0.321 g of sulphur in an evacuated and sealed tube, 1.743 g of white crystalline solid B produced, which produces a hydrated double salt C with `Al_(2)(SO_(4))_(3)`. Identfy A, B and C.

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