Ammonia is a Lewis base. It forms complexes with cations. Which one of the following cations does not form complex with ammonia
$A{g^ + }$
$C{u^{ + 2 }}$
$C{d^{ + 2 }}$
$P{b^{ + 2}}$
Which of the following element has maximum first ionisation potential
Which of the following is diamagnetic transitional metal ion
The pair of metal ions that can give a spin-only magnetic moment of $3.9\, BM$ for the complex $[M(H_2O)_6]Cl_2$ is
The catalyst used in the hydrogenation of oils is
Which of the following ions will exhibit colour in aqueous solutions?