Q.

Select the correct statement with respect to Fe3+ions:

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a

Iron (III) ions reacts with H2S in acidic solution to give a black precipitate of Fe2S3

b

Iron (III) ions react with ammonium sulphide to give the black precipitate of Fe2S3 

c

Iron (III) ions react with ammonium thiocyanate solution to produce deep red colouration

d

All of the above

answer is C.

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Detailed Solution

Iron (III) ions react with ammonium thiocyanate solution to produce deep red colouration. The synthesis of  Fe3(OH)2CH3COO6+ and the subsequent production of an undissociated iron (III) thiocyanate complex with ammonium thiocyanide gives deep red colour.

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Select the correct statement with respect to Fe3+ions: