Question

the pair of ions having same configuration is
1) Cr^3+, Fe^3+
2) Sc^3+, Cr^3+
3) Fe^3+,Co^3+
4) Fe^3+, Mn^3+
plz answer me
I will mark u as brain list
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Answer 1

Answer:

correct answer is 1 please mark has brainlist answer please thanks my all answer