Some salts,although containing two different metallic elements,give a test for only one of them in solution. Such salts are:

Which complex compound is most stable?

Which of the following represents the correct increasing order of the spectrochemical series (field strength) for some common ligands?

The deep blue colour produced on adding excess of ammonia to copper sulphate is due to the presence of:

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

The reaction of $Pb(NO_3)_2$ and $NaCl$ in water produces a precipitate that dissolves upon the addition of $HCl$ of appropriate concentration. The dissolution of the precipitate is due to the formation of