Amongst the following, the lowest degree of paramagnetism per mole of the compound at 298 K will be shown by

Among the following ions, which one has the highest paramagnetism?

Which of the following is formed when excess of KCN is added to acqueous solution of copper sulphate?

The complex ion which has no d-electrons in the central metal atom is

The compound having tetrahedral geometry is

Spin only magnetic moment of the compound $Hg[Co(SCN{)}_4]Hg[Co(SCN)\_4]$ is

Among the following metal carbonyls, the C-O bond order is lowest in

Both $[Ni(CO{)}_4][Ni(CO)\_4]$ and $[Ni(CN{)}_4{]}^{2-}[Ni(CN)\_4]^\{2-\}$ are diamagnetic. The hybridisations of nickel in these complexes respectively are

Among the following, the coloured compound is

The IUPAC name of the following compound $[Cr(N{H}_3{)}_5(C{O}_3)]Cl[Cr(NH\_3)\_5(CO\_3)]Cl$ is