Which of the following is true for $[Fe(CN)_6]^{3-}$ and $[FeF_6]^{3-}$?

The octahedral complex $[Co(NH_3)_5SO_4]Cl$ exists in two isomeric forms $X$ and $Y$. Isomer $X$ reacts with $AgNO_3$ to give a white precipitate,but does not react with $BaCl_2$. Isomer $Y$ gives a white precipitate with $BaCl_2$ but does not react with $AgNO_3$. Isomers $X$ and $Y$ are $.....$

$A$ compound absorbs light in the wavelength region $490-500 \,nm$. Its complementary colour is

Give an example of solvate isomerism.

The number of stereoisomers possible for $[Co(ox)_2(Br)(NH_3)]^{2-}$ is $...$. $[ox = \text{oxalate}]$

Explain the magnetic properties of coordination compounds.