Question

\[FeC{{l}_{3}}\] solution added to \[{{K}_{4}}{{\left[ Fe{{\left( CN \right)}_{6}} \right]}_{2}}\] gives \[A\] which \[KSCN\] gives \[B.\]
\[A\] and \[B\] respectively are:
A.\[F{{e}_{3}}{{\left[ Fe{{\left( CN \right)}_{6}} \right]}_{2}},Fe{{\left( CNs \right)}_{3}}\]
B.\[F{{e}_{4}}{{\left[ Fe{{\left( CN \right)}_{6}} \right]}_{3}},kFe{{\left( CNs \right)}_{3}}\]
C.\[F{{e}_{4}}{{\left[ Fe{{\left( CN \right)}_{6}} \right]}_{3}},{{K}_{3}}\left[ Fe{{\left( CNS \right)}_{6}} \right]\]
D.\[F{{e}_{4}}{{\left[ Fe{{\left( CN \right)}_{6}} \right]}_{3}},{{K}_{3}}\left[ Fe{{\left( SCN \right)}_{6}} \right]\]

Answer 1

Hint: We know that the potassium ferrocyanide is defined as an inorganic compound having the chemical formula \[{{K}_{4}}Fe{{\left( CN \right)}_{6}}\] (potassium ferrocyanide formula). Potassium ferrocyanide is otherwise called yellow potash prussiate, which is a yellow crystal.

Complete answer: Potassium ferrocyanide finds several niche applications in the industry. The related sodium salt is widely used as anti-caking agents for both table salt and road salt. The sodium and potassium Ferrocyanide can also be used in the separation of copper and from molybdenum ores and purification of tin.
Potassium ferrocyanide compound is used in the production of citric acid and wine. It is also used in animal feeding. Potassium ferrocyanide is used to determine potassium permanganate concentration in the laboratory, which is a compound often, used in titrations according to the redox reactions. Potassium ferrocyanide compound is used in a mixture with the phosphate-buffered solution and potassium ferricyanide to give a buffer for beta-galactosidase. Red It was made with either horn or wool clippings stirring hot potassium carbonate using an iron rod.
Potassium ferrocyanide compound can be used for certain iron processes as a developer and as an additive for alkaline pyro developers. Besides, Ferro Cyanogen produces the most metal compounds insoluble in water, where a few of which exhibit highly characteristic colors. It serves as a test for both ferric and cupric compounds. The first reaction is:
\[4FeC{{l}_{3}}+3{{K}_{4}}{{\left[ Fe{{\left( CN \right)}_{6}} \right]}_{2}}\to \underset{\begin{smallmatrix}
 ~~~~~Prussian\text{ }Blue \\
 ~~~~~~~~~~~~~~A~~~
\end{smallmatrix}}{\mathop{F{{e}_{4}}{{\left[ Fe{{\left( CN \right)}_{6}} \right]}_{3}}}}\,~+12KCl\]
\[{{K}_{4}}\left[ Fe{{\left( CN \right)}_{6}} \right]+KSCN\to \underset{\begin{smallmatrix}
 ~~~~~Deep\text{ }Red \\
 ~~~~~~~~~~~~B~
\end{smallmatrix}}{\mathop{{{K}_{4}}\left[ Fe{{\left( CNS \right)}_{6}} \right]}}\,+3KCl\]
Therefore, the correct answer is option C.

Additional information: It can be used to cleave, producing a bright blue visualization where an antibody (otherwise another molecule), conjugated to the Beta-gal, has bonded to its target. Also, by reacting with \[Fe\left( 3 \right),\] it produces a Prussian blue colour. Therefore, it can be used as an identifying reagent for iron in laboratories.

Note:
Remember that the potassium Ferrocyanide can be used in steel tempering and the engraving process. It is also employed in pigment manufacture and as a chemical reagent. A small amount in hydroquinone and pyro developers tends to lower fog and produce greater density. It is also used in potassium cyanide manufacture, which can be extensively used in gold mining.