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Q.

The reason for the stability of Gd3+  ion is

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a

 4f subshell-half filled

b

4f  subshell-completely filled

c

Possesses the general electronic configuration of noble gases

d

4f subshell empty

answer is A.

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Detailed Solution

Gd(Z=64)4f75d16s2Gd3+=4f7

Gd3+ is stable due to the presence of exactly half-filled 4f  -'subshell.

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The reason for the stability of Gd3+  ion is