Which of the following is paramagnetic
$N{i^{ + 2 }}$
$C{u^ + }$
$Z{n^{ + 2 }}$
$S{c^{ + 3 }}$
Transition metals are often paramagnetic owing to
Number of unpaired electrons in $M{n^{2 + }}$ is
For the following Assertion and Reason, the correct option is
Assertion : For hydrogenation reactions, the catalytic activity increases from Group $5$ to Group $11$ metals with maximum activity shown by Group $7-9$ elements.
Reason : The reactants are most strongly adsorbed on group $7-9 $ elements.
Amongst $TiF_6^{2 - },CoF_6^{3 - },C{u_2}C{l_2}$ and $NiCl_4^{2 - }$ (Atomic number $Ti = 22,$ $Co = 27,$ $Cu = 29,$ $Ni = 28$). The colourless species are
Magnetic moment is expressed in