First slide

Applications of complexes

Question

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

Difficult

A

${Fe}_{4} {[Fe {(CN)}_{6}]}_{3}$
B

$K_{3} {[Fe {(CN)}_{6}]}_{}$
C

${({NH}_{4})}_{2} {SO}_{4} . {FeSO}_{4} . 6 H_{2} O$
D

${Fe}_{3} {[Fe {(CN)}_{6}]}_{2}$

Solution

${Fe}_{4} {[Fe {(CN)}_{6}]}_{3} \underset{}{⇌} 4 {Fe}^{+ 3} + 3 {[Fe {(CN)}_{6}]}^{- 4}$
This 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

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