The Crystal Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion (MZ+) are –0.8 0 and 3.87 BM, respectively. ldrnbfy (MZ+): /kkrq vk;u] MZ+ ds ,d v"

Question

The Crystal Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion (MZ+) are –0.8 0 and 3.87 BM, respectively. ldrnbfy (MZ+): /kkrq vk;u] MZ+ ds ,d v"VQydh; tyh; ladqy ds fy, fØLVy {ks=k foikVu ÅtkZ (CFSE) ,oa pqEcdh; vk?kw.kZ (dsoy izpØ.k) gS] Øe'k% –0.8 0 rFkk 3.87 BMA MZ+ dks igpkusa %

(A) Cr3+
(B) Co2+
(C) V3+
(D) Mn4+

Prashant Kotian · Accepted Answer

Correct answer: B. CFSE for octahedral complex = [–0.4nt2g + 0.6 neg] 0 + n(P) As  = 3.87BM so number unpaired electron = 3. Metal ion configuration CFSE 27Co2+ = 3d7 25Mn4+ = 3d3 23V2+ = 3d3 24Cr3+ = 3d3 1, , g 2t , 1,1 g e 1,1,1 g 2t , , g e 1,1,1 g 2t , , g e 1,1,1 g 2t , , g e CFSE = – 0.80 CFSE = – 1.20 CFSE = – 1.20 CFSE = – 1.20

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