The set having ions which are coloured and paramagnetic both is :
$\mathrm{Sc}^{3+}, \mathrm{V}^{5+}, \mathrm{Ti}^{4+}$
$\mathrm{Cu}^{2+}, \mathrm{Cr}^{3+}, \mathrm{Sc}^{+}$
$\mathrm{Ni}^{2+}, \mathrm{Mn}^{7+}, \mathrm{Hg}^{2+}$
$\mathrm{Cu}^{+}, \mathrm{Zn}^{2+}, \mathrm{Mn}^{4+}$
A transition metal ' $\mathrm{M}$ ' among $\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Fe}$ has the highest second ionisation enthalpy. The spin only magnetic moment value of $\mathrm{M}^{+}$ion is. . . . . . .$\mathrm{BM}$ (Near integer)
(Given atomic number $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}$ : $24, \mathrm{Mn}: 25, \mathrm{Fe}: 26)$
A first row transition metal in its $+2$ oxidation state has a spin-only magnetic moment value of $3.86 \mathrm{BM}$ The atomic number of the metal is
Metre scales are made-up of alloy
The correct order of the first ionization enthalpies is
A compound of a metal ion $M^{x+}$ $(Z = 24)$ has a spin only magnetic moment of $\sqrt {15}$ Bohr Magnetons. The number of unpaired electrons in the compound are