`0.5 m` solution of a complex of iron and cyanide ions has the depression of freezing point to be `3.72 K` (`K_f` for

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Q 1280180017.     `0.5 m` solution of a complex of iron and cyanide ions has the depression of freezing point to be `3.72 K` (`K_f` for water = `1 .86` `text(molal)^(–1)`). Identify the formula of the complex.
A

`K_3[Fe(CN)_6]`

B

`Fe(CN)_4`

C

`K_2[Fe(CN)_4]`

D

`K_4[Fe(CN)_6]`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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