A) Ammonium hydroxide dissolves in copper sulphate
B) 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
Correct Answer: B
Solution :
\[CuS{{O}_{4}}+{{K}_{4}}[Fe{{(CN)}_{6}}]\to \] no reaction \[4N{{H}_{4}}OH+CuS{{O}_{4}}\to \underset{\text{Deep}\,\text{blue}}{\mathop{[Cu{{(N{{H}_{3}})}_{4}}]}}\,\,S{{O}_{4}}+4{{H}_{2}}O\] \[\underset{\text{Anhydrous}}{\mathop{CuS{{O}_{4}}}}\,+5{{H}_{2}}O\to \underset{\text{Blue}}{\mathop{CuS{{O}_{4}}}}\,.5{{H}_{2}}O\] \[4FeC{{l}_{3}}+3N{{a}_{4}}[Fe{{(CN)}_{6}}]\to \underset{\begin{smallmatrix} \text{Ferric}\,\text{ferrocyanide} \\ \,\,\,\,\,\text{(Prussian}\,\text{blue)} \end{smallmatrix}}{\mathop{F{{e}_{4}}[Fe{{(CN)}_{6}}]}}\,+12NaCl\]
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