The $[Fe(CN)_6]^{3-}$ complex ion

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

Out of the following complex compounds,which of the compound will have the minimum conductance in solution?

When $0.1 \ mole$ of $CoCl_3(NH_3)_5$ is treated with excess of $AgNO_3$,$0.2 \ mole$ of $AgCl$ are obtained. The conductivity of the solution will correspond to:

With which of the following will ammonia $NOT$ form a complex compound?

$AgCl$ precipitate dissolves in ammonia due to the formation of