Question

reaction distinguishe between Fe2+ and Fe3+

Answer 1

Fe2+Fe2+, is pale green and turns violet when added to water while Fe3+Fe3+,  is yellow-brown in solution. 
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Answer 2

Hey..!!

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As mentioned, the tests are simple precipitation reactions. A solution of a Iron salt (Iron Ammonium Sulphate solution for Fe2+ and Iron Chloride for Fe3+.) was mixed with an equal ammount of another solution, which give a physical change, usually a colour change due to a precipitation of the Iron insoluble compound or formation of a complex since Iron is a transitional metal.

Fe++ X (aq) + 2 Na+ Y- (aq) ===> Fe++ Y (s) + 2 Na+ X- (aq)
(s) Solid precipitate forming a colour change in soultion

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