If Aufbau principle and Hund's rule were not followed
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a
Ca would have been d-block element
b
Zn would have been S - block element
c
Ti would have been diamagnetic
d
Fe3+ ion would have 6 unpaired electrons
answer is A.
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Detailed Solution
For no consideration of Aufbau principle and Hunds rule, the electronic configuration Ca(20):[.Ar]3d2 Zn(30):[Ar]3d104s2 (filling of 4s sub shell after 3dsubshell) Ti(22): [Ar]3d2 (both electrons paired up)