The hardness of $Cr$ is due to $......$ and metallic lustre is due to $.......$

The ions of $d$-block elements are paramagnetic because.....

Which of the following alloys contain only $Cu$ and $Zn$?

Which one of the following ions is colourless?

Which among the following cations will not form coloured compounds? (Atomic number $Cu=29, Ti=22, V=23, Mn=25$)

Among $Sc$,$Mn$,$Co$ and $Cu$,identify the element with the highest enthalpy of atomisation. The spin-only magnetic moment value of that element in its $+2$ oxidation state is $......... \text{BM}$ (in nearest integer).