List of top Chemistry Questions on Electronic Configurations of the d-Block Elements asked in CBSE CLASS XII

From the elements of 3d series below, which element shows the maximum number of oxidation states?
Compounds of transition metals are generally coloured. Give reason.
Why are transition elements good catalysts?
Why is first ionization enthalpy of chromium lower than that of Zn?
The general electronic configuration of d-block elements is: