In an aqueous solution ferric ion gives blood red colour with potassium thiocyanate solution. Which of the following gives blood red colour with KSCN solution
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a
Fe4FeCN63
b
K3FeCN6
c
NH42SO4. FeSO4.6H2O
d
Fe3FeCN62
answer is A.
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Detailed Solution
Fe4FeCN63 ⇌ 4Fe+3+3FeCN6−4This solution contains free Fe+3 ion(2) & (4) --Fe+3 ion is in complex ion ….It cannot react with SCN– ion(3) Does’nt contain Fe+3 ion