Q.

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)
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If Aufbau principle and Hund's rule were not followed