Which forms coloured salts

For $d-$ block elements the first ionization potential is of the order

Melting point of  $FeCl_3$  and  $FeCl_2$  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.

Consider the hydrated ions of $Ti^{2+}, V^{2+}, Ti^{3+}$ and $Sc^{3+}$. The correct order of their spin-only magnetic moments is

Stainless steel contains ........... $\%$ $Cr$