When a metal (X) is treated with NaOH a white precipitate (A) is obtained, which is soluble in excess of NaOH to give a soluble complex (B). Compound (A) is soluble in dilute HCl to form a compound (C). The compound (A) when heated strongly gives (D) which is used to extract metal. Identify (X), (A), (B), (C) and (D). Write suitable equations to support your answer.

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