MCQ
A blue colouration is not obtained when
- AAmmonium hydroxide dissolves in copper sulphate
- ✓Copper sulphate solution reacts with ${K_4}[Fe{(CN)_6}]$
- CFerric chloride reacts with sodium ferrocyanide
- DAnhydrous $CuS{O_4}$ is dissolved in water
✓
Answer
Correct option: B.
Copper sulphate solution reacts with ${K_4}[Fe{(CN)_6}]$
b
(b) $CuS{O_4} + {K_4}[Fe{(CN)_6}] \to $ no reaction
(b) $CuS{O_4} + {K_4}[Fe{(CN)_6}] \to $ no reaction
$4N{H_4}OH + CuS{O_4} \to \mathop {[Cu{{(N{H_3})}_4}]}\limits_{{\rm{Deep}}\,{\rm{blue}}} \,S{O_4} + 4{H_2}O$
$\mathop {CuS{O_4}}\limits_{{\rm{Anhydrous}}} + 5{H_2}O \to \mathop {CuS{O_4}}\limits_{{\rm{Blue}}} .5{H_2}O$
$4FeC{{l}_{3}}+3N{{a}_{4}}[Fe{{(CN)}_{6}}]\to \underset{\begin{smallmatrix}
\text{Ferric}\,\text{ferrocyanide} \\
\,\,\,\,\,\text{(Prussian}\,\text{blue)}
\end{smallmatrix}}{\mathop{F{{e}_{4}}[Fe{{(CN)}_{6}}]}}\,+12NaCl$
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