A) \[{{K}_{3}}[\overset{(III)}{\mathop{Fe}}\,\,{{(CN)}_{6}}],\,\,{{K}_{4}}[\overset{(II)}{\mathop{Fe}}\,\,{{(CN)}_{6}}]\]
B) \[K\overset{(II)}{\mathop{Fe}}\,\,[\overset{(III)}{\mathop{Fe}}\,\,{{(CN)}_{6}}],\,\,K\overset{(III)}{\mathop{Fe}}\,\,[\overset{(II)}{\mathop{Fe}}\,\,{{(CN)}_{6}}]\]
C) \[\overset{\,\,\,\,\,\,\,\,(III)}{\mathop{KFe}}\,\,[\overset{(II)}{\mathop{Fe}}\,\,{{(CN)}_{6}}],\,\,\overset{\,\,\,\,\,\,\text{(II)}}{\mathop{KFe}}\,\,[\overset{(III)}{\mathop{Fe}}\,\,\,{{(CN)}_{6}}]\]
D) \[{{K}_{4}}\,[\overset{(II)}{\mathop{Fe}}\,\,{{(CN)}_{6}}],\,\,{{K}_{3}}\,[\overset{(III)}{\mathop{Fe}}\,\,\,{{(CN)}_{6}}]\]
E) \[\,[\overset{(II)}{\mathop{KFe}}\,\,[\overset{(II)}{\mathop{Fe}}\,\,{{(CN)}_{6}}],\,\,\,[\overset{(III)}{\mathop{KFe}}\,\,\,[\overset{(III)}{\mathop{Fe}}\,\,{{(CN)}_{6}}]\]
Correct Answer: B
Solution :
Turn bulls blue colour is obtained when \[F{{e}^{2+}}\] salt react with \[{{K}_{3}}[\overset{\text{III}}{\mathop{Fe}}\,\,{{(CN)}_{6}}]\] and Prussians blue colour is obtained when \[F{{e}^{3+}}\] salts react with \[{{K}_{4}}[\overset{\text{III}}{\mathop{Fe}}\,\,{{(CN)}_{6}}]\] \[\overset{\text{II}}{\mathop{Fe}}\,C{{l}_{2}}+{{K}_{3}}[Fe{{(CN)}_{6}}]\xrightarrow{{}}\]\[\underset{Turn\,bulls\,blue}{\mathop{K\overset{\text{II}}{\mathop{Fe}}\,\,[\overset{\text{III}}{\mathop{Fe}}\,{{(CN)}_{6}}]}}\,+2KCl\] \[\overset{\text{III}}{\mathop{Fe}}\,C{{l}_{3}}+{{K}_{4}}[\overset{\text{II}}{\mathop{Fe}}\,\,{{(CN)}_{6}}]\xrightarrow{{}}\]\[\underset{Prussains\,blue}{\mathop{K\overset{\text{III}}{\mathop{Fe}}\,\,[\overset{\text{II}}{\mathop{Fe}}\,\,{{(CN)}_{6}}]}}\,+3KCl\]
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