When metal X is treated with sodium hydroxide, a white predpitate

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#1

When metal X is treated with sodium hydroxide, a white predpitate (A) is obtained, which is soluble in excess of NaOH to give soluble complex (B). Compound (A) is soluble in dilute HC1 to form compound ©, die comound (A) when heated strongly gives (D), which is used to extract metal. Identify (X), (A), (B), © and (D). Write soluble equations to support their identities


#2