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(a) A white precipitate (B) is formed wh...

(a) A white precipitate (B) is formed when a mineral (A) is boiled with `Na_(2)CO_(3)` solution.
(b) The precipitate is filtered and the filterate contains two compounds (C) and (D). The compound (C) is removed by crystallisation and when `CO_(2)` is passed through the mother liquor left, (D) changes to (C).
(c) The compound (C) on strong heating gives two compounds D & E.
(d) (E) on heating with cobalt oxide produces blue coloured substance (F). identify (A) to (F) and give chemical reactions, by the each step.

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(a) On bolining a mineral (A) with Na_2CO_(3) solution, a white precipirtate (B) is formed. (b) The precipitate is fitered and the filtrate contains two conpounds ( C) and (D) . The componds ( C) is removed by crystallisation and when CO_(2) is passed through the mother liquor left, (D) changes to ( C) . ( c) On strongly heating ( C) , two compounds (D) and ( E) are formed. (d) (E) on heating with cobalt oxide provides blue-coloured substance (F) . Identify (A) to (F) and give chemical reaction for (a) to (d) .

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