Question: 2. When sodium hydroxide solution was added to a solution of an unknown compound, a green precipitate was formed which was insoluble in excess. Which

2. When sodium hydroxide solution was added to a solution of an unknown compound, a green precipitate was formed which was insoluble in excess. Which one of the following cations did the unknown solution contain?

(a) copper(II) ion

(b) iron(II) ion

(c) iron(III) ion

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