Cuprous ion is colourless, while cupric ion is coloured because
Both have unpaired electrons in $d$-orbital
Cuprous ion has a completed $d$-orbital and cupric ion has an incomplete $d$-orbital
Both have half-filled $p$and $d$-orbitals
Cuprous ion has incomplete $d$-orbital and cupric ion has a completed $d$-orbital
The statement that is $INCORRECT$ about the interstitial compound is
$Fe,$ $Co$ and $Ni$ have valuable catalytic properties in process involving
A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula $\mathrm{M}_2 \mathrm{O}_{\mathrm{n}}$ (where $\mathrm{n}=3,4,5$ ). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is. . . . . . ..$\mathrm{BM}$ (near integer)
(Given atomic number: $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23$, $\mathrm{Cr}: 24, \mathrm{Mn}: 25, \mathrm{Fe}: 26, \mathrm{Co}: 27, \mathrm{Ni}: 28, \mathrm{Cu}: 29$, $\mathrm{Zn}: 30)$
Highest $(+7) $ oxidation state is shown by
Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be $......$