A sample of metal X has a high melting point, forms a green precipitate with sodium hydroxide solution, and its aqueous solution is green. Which metal is X most likely to be?

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Question

A sample of metal X has a high melting point, forms a green precipitate with sodium hydroxide solution, and its aqueous solution is green. Which metal is X most likely to be?

Accepted Answer

Iron — Iron(II) ions (Fe²⁺) in aqueous solution appear green, and they form a green precipitate of Fe(OH)₂ when sodium hydroxide is added. Copper(II) ions give a blue solution and blue precipitate; zinc gives a white precipitate; nickel gives a green precipitate but its aqueous solution is also green — however the classic IGCSE answer linking green solution to green precipitate points to Fe²⁺.

Answer

Iron

Answer

Copper

Answer

Zinc

Answer

Nickel

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