Which of the following is not true for transition metals
They are malleable and ductile
They have high boiling and melting points
They crystallize with body centred cubic and hexagonal close-packed structures only
They show variable oxidation states although not always
Why do the transition elements exhibits variable oxidation states?
How would you account for the following:
$(i)$ of the $d^{4}$ species, $Cr ^{2+}$ is strongly reducing while manganese $(III)$ is strongly oxidising.
$(ii)$ Cobalt $(II)$ is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.
$(iii)$ The $d^{1}$ configuration is very unstable in ions.
In the following members of transition elements, the lowest ionization energy is of
Choose the correct statement regarding transition elements?
The "spin-only" magnetic moment [ in units of Bohrmagneton, $(\mu _B )$ ] of $Ni^{2+}$ in aqueous solution would be (At. No. $Ni= 28)$