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`{:("Column-I","Column-II"),("Species","Characteristics"),((A)Co^(3+)(Z=27),(p)"Total number of fully filled orbitals is nine"),((B)Sc^(3+)(Z=21),(q)"The value of magnetic moment (spin only) is greater than or equal to 3.87 BM"),((C )Cr^(3+)(Z=24),(r)"Number of electrons with (n+l=3) is eight"),((D)Ni^(2+)(Z=28),(s) "Number of electrons with (m=0) may be either 11 or 12 "),(,(t)"No unpaired electron"):}` |
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Answer» Correct Answer - A-q,r,s ; B-p,r,t ; C-p,q,r,s ; D-r,s (A)`Co^(3-):1s^2 2s^2 2p^6 3s^2 3p^6 3d^6` so no of fully filled orbitals is 10. no of unpaired electrons =4 So, magnetic moment is greater than 3.87 no of electrons with n+l=3 i.e. 3s, 2p are eight. (B)`Sc^(3+):1s^2 2s^2 2p^6 3s^2 3p^6 ` no of fully filled orbitals is 9. no of unpaired electrons =zero no of electrons with n+l=3 i.e. 3s, 2p are eight. no of electrons with m=0 are ten. (C )`Cr^(3+):1s^2 2s^2 2p^6 3s^2 3p^6 3d^3` no of fully filled orbitals is 9. no of unpaired electrons =3 no of electrons in 3s & 2p are eight no of electrons with m=0 may be 11 (D)`Ni^(2+):1s^2 2s^2 2p^6 3s^2 3p^6 3d^8` so no of fully filled orbitals is 12. no of unpaired electrons =2 no of electrons in 3s & 2p is eight no of electrons with m=0 may be 11 or 12 |
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