A) \[\text{Mn}{{\text{O}}_{\text{2}}}\text{andCr}{{\text{O}}_{\text{2}}}\text{C}{{\text{l}}_{\text{2}}}\]
B) \[{{\text{ }\!\![\!\!\text{ Fe(CN}{{\text{)}}_{\text{6}}}\text{ }\!\!]\!\!\text{ }}^{\text{3-}}}\text{and}\,{{\text{ }\!\![\!\!\text{ Cu(CN}{{\text{)}}_{\text{4}}}\text{ }\!\!]\!\!\text{ }}^{\text{2-}}}\]
C) \[{{[NIC{{l}_{4}}]}^{2-}}and{{[CoC{{l}_{4}}]}^{2-}}\]
D) \[{{\text{ }\!\![\!\!\text{ FeC}{{\text{l}}_{\text{4}}}\text{ }\!\!]\!\!\text{ }}^{\text{-}}}\text{andC}{{\text{o}}_{\text{2}}}{{\text{O}}_{\text{3}}}\]
Correct Answer: A
Solution :
\[Mn{{O}_{2}}=+4\] \[Cr{{O}_{2}}C{{l}_{2}}=+6\]
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