Identify the highest field strength ligand from the following.

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$HgI_2 \downarrow + 2KI \longrightarrow K_2[HgI_4]$

The molar ionic conductances of the octahedral complexes are in the order of:
$(1) PtCl_4 \cdot 5NH_3$
$(2) PtCl_4 \cdot 4NH_3$
$(3) PtCl_4 \cdot 3NH_3$
$(4) PtCl_4 \cdot 2NH_3$

Which of the following has the highest molar conductivity in solution?

When $Co(II)$ chloride is dissolved in concentrated $HCl$,a blue solution is obtained. Upon dilution with water,the colour changes to pink because:

Among the properties $(a)$ reducing,$(b)$ oxidising,$(c)$ complexing,the set of properties shown by $CN^{-}$ ion towards metal species is