The number of isoelectronic species among Sc³, Cr², Mn³, Co³ and Fe³ is ‘n’. If ‘n’ moles of AgCl is formed during the reaction of complex with formula CoCl(en)NH with excess of AgNO solution, then the number of electrons present in the tg orbit

Question

The number of isoelectronic species among $Sc³⁺, Cr²⁺, Mn³⁺, Co³⁺$ and $Fe³⁺$ is ‘n’. If ‘n’ moles of AgCl is formed during the reaction of complex with formula ${CoCl}_{3} {(en)}_{2} {NH}_{3}$ with excess of ${AgNO}_{3}$ solution, then the number of electrons present in the $t_{2 g}$ orbital of the complex is __________. [2026]

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(6)

${Sc}^{3 +}$	18
${Cr}^{2 +}$	22
${Mn}^{3 +}$	22
${Co}^{3 +}$	24
${Fe}^{3 +}$	23

${Cr}^{2 +} {and Mn}^{3 +} are isoelectronic$

$n = 2$

$Complex is: [{Co(en)}_{2} {NH}_{3} Cl] {Cl}_{2}$

$\Rightarrow {Co}^{3 +} 3 d^{6} t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$

Solution

Ans.
(6)

${Sc}^{3 +}$ 18

${Cr}^{2 +}$ 22

${Mn}^{3 +}$ 22

${Co}^{3 +}$ 24

${Fe}^{3 +}$ 23

${Cr}^{2 +} {and Mn}^{3 +} are isoelectronic$

$n = 2$

$Complex is: [{Co(en)}_{2} {NH}_{3} Cl] {Cl}_{2}$

$\Rightarrow {Co}^{3 +} 3 d^{6} t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$

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Solution

Ans. (6) Sc3+ 18 Cr2+ 22 Mn3+ 22 Co3+ 24 Fe3+ 23 Cr2+ and Mn3+ are isoelectronic n=2 Complex is: [Co(en)2NH3Cl]Cl2 ⇒Co3+ 3d6 t2g2,2,2 eg0,0

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Ans.
(6)

${Sc}^{3 +}$ 18

${Cr}^{2 +}$ 22

${Mn}^{3 +}$ 22

${Co}^{3 +}$ 24

${Fe}^{3 +}$ 23

${Cr}^{2 +} {and Mn}^{3 +} are isoelectronic$

$n = 2$

$Complex is: [{Co(en)}_{2} {NH}_{3} Cl] {Cl}_{2}$

$\Rightarrow {Co}^{3 +} 3 d^{6} t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$