Spin-only magnetic moment or unpaired electrons of given 3d ions

1. A.
   5.92
2. B.
   5.0
3. C.
   zero
4. D.
   5.26

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1. A.
   $0,2.8,1$
2. B.
   $1.5,0,2.8$
3. C.
   $0,3.9,2.8$
4. D.
   $1,2.7,3.9$

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1. A.
   $V^{2 +}$
2. B.
   ${Ni}^{2 +}$
3. C.
   ${Cr}^{2 +}$
4. D.
   ${Fe}^{2 +}$

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1. A.
   $\lbrack Ar\rbrack 3{\text{ }d}^{7}$
2. B.
   $\lbrack Ar\rbrack 3{\text{ }d}^{8}$
3. C.
   $\lbrack Ar\rbrack 3{\text{ }d}^{3}$
4. D.
   $\lbrack Ar\rbrack 3{\text{ }d}^{6}$

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1. A.
   (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
2. B.
   (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
3. C.
   (A)-(IV), (B)-(II), (C)-(III), (D)-(I)
4. D.
   (A)-(II), (B)-(IV), (C)-(I), (D)-(III)

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1. A.
   A, C and E only
2. B.
   A, D and E only
3. C.
   B and E only
4. D.
   A, B and E only

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1. A.
   $V^{2 +},{Co}^{2 +}$
2. B.
   ${Ti}^{2 +},{Co}^{2 +}$
3. C.
   ${Fe}^{3 +},{Cr}^{2 +}$
4. D.
   ${Ti}^{3 +},{Mn}^{2 +}$

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