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Q.

The pair of ions which do not have same number of unpaired electrons is

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a

Ti2+ and Ni2+

b

 Mn2+ and Fe3+ 

c

 Fe2+ and Ni2+

d

Cu2+ and Ti3+ 

answer is D.

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Detailed Solution

The electronic configurations:

Fe2+ (26) 4s03d6 =4 unpaired electrons

Mn2+ (25)4s03d5=5 unpaired electrons

Ni2+ (28)4s03d8 =2 unpaired electrons

Cu2+  (29)4s03d9 =1 unpaired electron

Ti+2 (22) 4s03d2 =2 unpaired electrons

Ti+3 (22) 4s03d1 =1 unpaired electron

Fe3+ (26) 4s03d5 =5 unpaired electrons

Hence, the correct option is option (D) Fe2+ and Ni2+

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The pair of ions which do not have same number of unpaired electrons is