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STD 12 - 4. d and f- block elements — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 4. d and f- block elements4 Marks
MCQ
A blue colouration is not obtained when
  • A
    Ammonium hydroxide dissolves in copper sulphate
  • ✓
    Copper sulphate solution reacts with ${K_4}[Fe{(CN)_6}]$
  • C
    Ferric chloride reacts with sodium ferrocyanide
  • D
    Anhydrous $CuS{O_4}$ 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

$4N{H_4}OH + CuS{O_4} \to \mathop {[Cu{{(N{H_3})}_4}]}\limits_{{\rm{Deep}}\,{\rm{blue}}} \,S{O_4} + 4{H_2}O$

$\mathop {CuS{O_4}}\limits_{{\rm{Anhydrous}}} + 5{H_2}O \to \mathop {CuS{O_4}}\limits_{{\rm{Blue}}} .5{H_2}O$

$4FeC{{l}_{3}}+3N{{a}_{4}}[Fe{{(CN)}_{6}}]\to \underset{\begin{smallmatrix} 
 \text{Ferric}\,\text{ferrocyanide} \\ 
 \,\,\,\,\,\text{(Prussian}\,\text{blue)} 
\end{smallmatrix}}{\mathop{F{{e}_{4}}[Fe{{(CN)}_{6}}]}}\,+12NaCl$

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