In which of the following pairs are both the ions coloured in aqueous solution ?
(At. no. : $Sc = 21, Ti = 22, Ni = 28,$$ Cu = 29, Co = 27$)
$Ni^{2+}, Cu^+$
$Ni^{2+}, Ti^{3+}$
$Sc^{3+}, Ti^{3+}$
$Sc^{3+}, Co^{2+}.$
Which of the following pair of ions may exhibit same colour
Most stable compound among the following is
The number of unpaired electrons in ferrous ion is
Amongest following the lowest degree of paramagnetism per mole of the compound at $298 K$ will be shown by
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