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Q.

The pair in which both the elements show anomalous configuration is

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a

Cr , Zn

b

Cr , Cu

c

Cu , Zn

d

Cu , Mn

answer is B.

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Detailed Solution

Cu(Z=29)….1s22s22p63s23p64s13d10;Cr(Z=24)….1s22s22p63s23p64s13d5;Extra stability due to half filled and completely filled sub-shells ;
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The pair in which both the elements show anomalous configuration is