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A heptahydrate of formula [M(H(2)O)(6)]S...

A heptahydrate of formula `[M(H_(2)O)_(6)]SO_(4).H_(2)O` is Isomorphous with white vitriol. The hydrated salt heated to `200^(@)C` becomes anhydrous and when becomes red hot decomposed to its oxide `SO_(2) and O_(2)`. The compound is needle shaped solid used as purgative. It can be Identified with `Na_(2)HPO_(4)`. Identify the salt?

A

Epsomite/Epsom salt

B

Nitrochalk

C

Anhydrone

D

microcosmic salt

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