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Q.

Which of the following reactions predict the presence of ferric ion?

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a

It gives red brown ppt with NaOH insoluble in excess of NaOH

b

By adding ammonium thiocyanate blood red colour is formed

c

Addition of potassium ferrocyanide forms dark blue precipitate

d

On passing H2S into acidified solution changes to green colour with turbidity

answer is A, B, C, D.

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Detailed Solution

FeCl3+3NaOH3NaCl+FeOH3Brown  Ppt 

FeCl3+3NH2SCN3NH4Cl+FeSCN3Blood red4FeCl3+3K4FeCN6Fe4FeCN63Blue ppt+12KCl2FeCl3+H2S2FeCl2+2HCl  Green+STurbidity

 

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