While testing for 3rd group ions using ammonium hydroxide solution,if greenish precipitate occurs then it confirms that solution contains iron with oxidation state __________

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Solution

The group is determined by making a solution of the salt in water and adding ammonium chloride and ammonium hydroxide. Ammonium chloride is added to ensure low concentration of hydroxide ions.

The formation of a reddish-brown precipitate indicates $F e^{3 +}$ ; a gelatinous white precipitate indicates $A l^{+ 3}$ ; and a green precipitate indicates $C r^{+ 3}$ or $F e^{+ 2}$

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{F e}^{3 +}

An unknown solution that produced a pale blue precipitate with sodium hydroxide solution, and a green-blue flame test, must contain a:

{A l}^{3 +}

{C a}^{2 +}

Which solution gives a white precipitate with excess ammonium hydroxide solution.

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