Which one of the following ions is colourless
$C{u^ + }$
$C{o^{2 + }}$
$N{i^{2 + }}$
$F{e^{3 + }}$
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.
The ionic radius of $Cr$ is minimum is which of the following compounds
Bullet-proof steel alloy is prepared by using
Misch metal an alloy of
Which of the following set of elements does not belong to transitional elements set