Number of complexes from the following with even number of unpaired "d" electrons is____. [V(H2O)6]3+, [Cr(H2O)6]2+, [Fe(H2O)6]3+, [Ni(H2O)6]3+, [Cu(H2O)6]2+ [Given atomic numbers : V = 23, Cr = 24, F

Question

Number of complexes from the following with even number of unpaired "d" electrons is____. [V(H2O)6]3+, [Cr(H2O)6]2+, [Fe(H2O)6]3+, [Ni(H2O)6]3+, [Cu(H2O)6]2+ [Given atomic numbers : V = 23, Cr = 24, Fe = 26, Ni = 28, Cu = 29]

(A) 2
(B) 4
(C) 5
(D) 1

Prashant Kotian · Accepted Answer

Correct answer: A. [V(H2O)6]3+  d2sp3 23V :- [Ar]3d34s2 V+3 :- [Ar]3d2 , n = 2 (even number of unpaired e–) [Cr(H2O)6]2+  sp3d2 24Cr :- [Ar]3d54s1 Cr+2 :- [Ar]3d4 , n = 4 (even number of unpaired e–) eg t2g [Fe(H2O)6]3+  sp3d2 Fe3+  [Ar]3d54s0 n = 5 (odd number of unpaired e–) [Ni(H2O)6] 3+  sp3d2 Ni :- [Ar]3d84s2 Ni+3 :- [Ar]3d7 , n = 3 (odd number of unpaired e–) [Cu(H2O)6]2+  sp3d2 Cu :- [Ar]3d94s0 n = 1 (odd number of unpaired e–)

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