Q2 / 90 · JEE Main 2021 (01 Sep Shift 2) · Chemistry

The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

A
${CoCl}_{3}$
B
${CoCl}_{2}$
C
${FeCl}_{2}$
Correct answer
D
${FeCl}_{3}$

Solution

$6 NaCN + {FeSO}_{4} ⟶ {Na}_{4} [Fe (CN)_{6}]$

${Na}_{4} [Fe (CN)_{6}] + 4 {Fe}^{3 +} \overset{{xH}_{2} O}{⟶} \underset{Ferric ferrocyanide (Prussian blue complex)}{{Fe}_{4} {[Fe (CN)_{6}]}_{3} . {xH}_{2} O}$

Hence, the correct answer is option: 'D'.

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