Which of the following complexes will exhibit maximum attraction to an applied magnetic field? [2023]

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Q.
Which of the following complexes will exhibit maximum attraction to an applied magnetic field [2023]

1 ${[Zn {(H_{2} O)}_{6}]}^{2 +}$

2 ${[Ni {(H_{2} O)}_{6}]}^{2 +}$

3 ${[Co {(en)}_{3}]}^{3 +}$

4 ${[Co {(H_{2} O)}_{6}]}^{2 +}$

Ans.
(4)

Complex with maximum number of unpaired electron will exhibit maximum attraction to an applied magnetic field.

Complex Electronic configuration No. of unpaired electrons

${[{Co (en)}_{3}]}^{3 +}$ ${Co}^{3 +} : 3 d^{6} \Rightarrow t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$ 0

${[{Co (H_{2} O)}_{6}]}^{2 +}$ ${Co}^{2 +} : 3 d^{7} \Rightarrow t_{2 g}^{2, 2, 1} e_{g}^{1, 1}$ 3

${[{Ni (H_{2} O)}_{6}]}^{2 +}$ ${Ni}^{2 +} : 3 d^{8} \Rightarrow t_{2 g}^{2, 2, 2} e_{g}^{1, 1}$ 2

${[{Zn (H_{2} O)}_{6}]}^{2 +}$ ${Zn}^{2 +} : 3 d^{10} \Rightarrow t_{2 g}^{2, 2, 2} e_{g}^{2, 2}$ 0

Solution

Q.
Which of the following complexes will exhibit maximum attraction to an applied magnetic field [2023]

1 ${[Zn {(H_{2} O)}_{6}]}^{2 +}$

2 ${[Ni {(H_{2} O)}_{6}]}^{2 +}$

3 ${[Co {(en)}_{3}]}^{3 +}$

4 ${[Co {(H_{2} O)}_{6}]}^{2 +}$

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Complex	Electronic configuration	No. of unpaired electrons
${[{Co (en)}_{3}]}^{3 +}$	${Co}^{3 +} : 3 d^{6} \Rightarrow t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$	0
${[{Co (H_{2} O)}_{6}]}^{2 +}$	${Co}^{2 +} : 3 d^{7} \Rightarrow t_{2 g}^{2, 2, 1} e_{g}^{1, 1}$	3
${[{Ni (H_{2} O)}_{6}]}^{2 +}$	${Ni}^{2 +} : 3 d^{8} \Rightarrow t_{2 g}^{2, 2, 2} e_{g}^{1, 1}$	2
${[{Zn (H_{2} O)}_{6}]}^{2 +}$	${Zn}^{2 +} : 3 d^{10} \Rightarrow t_{2 g}^{2, 2, 2} e_{g}^{2, 2}$	0

Solution

Q. Which of the following complexes will exhibit maximum attraction to an applied magnetic field [2023]

1 [Zn(H2O)6]2+

2 [Ni(H2O)6]2+

3 [Co(en)3]3+

4 [Co(H2O)6]2+

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Q.
Which of the following complexes will exhibit maximum attraction to an applied magnetic field [2023]

1 ${[Zn {(H_{2} O)}_{6}]}^{2 +}$

2 ${[Ni {(H_{2} O)}_{6}]}^{2 +}$

3 ${[Co {(en)}_{3}]}^{3 +}$

4 ${[Co {(H_{2} O)}_{6}]}^{2 +}$