Silver chloride dissolves in

In which one of the following pairs of ions is there an ion that forms a coordination compound with both aqueous sodium hydroxide and ammonia,and another ion that forms a coordination compound only with aqueous sodium hydroxide?

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

Which of the following is the correct increasing order of ligand field strength according to the spectrochemical series?

An aqueous pink solution of Cobalt $(II)$ chloride changes to deep blue on addition of excess of $HCl$. This is because:

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