Which one will give \[F{{e}^{3+}}\] ions in solution

1.	Which one will give \[F{{e}^{3+}}\] ions in solution
A.	\[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{3-}}\]
B.	\[F{{e}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\]
C.	\[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{4-}}\]
D.	\[N{{H}_{4}}{{(S{{O}_{4}})}_{2}}.FeS{{O}_{4}}.6{{H}_{2}}O\]
Answer» C. \[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{4-}}\]

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Which one will give \[F{{e}^{3+}}\] ions in solution

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