The ionisation energies of transition elements are
less than $p-$ block elements
more than $s-$ block elements
less than $s-$ block elements
Both $(a)$ and $(b)$
The element the usually does $NOT$ show variable oxidation states is
The catalytic activity of the transition metal and their compound is due to their
Which of the following will give green hydrated ion
Amongst $Ti{F_6}^{2 - }\,,\,Co{F_6}^{3 - }\,,\,C{u_2}C{l_2}$ and $NiCl_4^{2-}$ the colourless species are