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A complex of iron and cyanide ions is 10...

A complex of iron and cyanide ions is `100% ` ionised at 1m (molal). If its elevation in b.p.is `2.08^@C`. Then the complex is `(K_b=0.52 K mol^-1 kg)`:

A

`K_3[Fe(CN)_6]`

B

`Fe(CN)_2`

C

`K_4[Fe(CN)_6]`

D

`Fe(CN)_4`

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