Consider following complex formation reactions : (i) Co ( aq. ) 3 + + KCN ( excess ) ⇌ complex ion'P' Complex 'P' have secondary valency of central metal = 6 (ii) Ni ( aq . ) 2

Question

Consider following complex formation reactions :

(i) $Co_{(aq.)}^{3 +} + KCN_{(excess)} ⇌$ complex ion'P'

Complex 'P' have secondary valency of central metal = 6

(ii) $Ni_{(aq .)}^{2 +} + KCN_{(excess)} ⇌$ complex ion ' Q '

(iii) $Cu_{(aq.)}^{2 +} + KCN_{(excess)} ⇌$ complex ion' $R^{'}$

and find the value of expression $∣ X + Y - Z ∣$ for complex ions ' P ', ' Q ' and ' R ' as per CFT .

where

X = Total number of electrons present in t_2g orbitals of central metal of complex ion 'P'

Y = Total number of electrons present in $d_{x^{2} - y^{2}}$

orbital of central metal of complex ion 'Q'

Z = Total number of electrons present in $d_{x^{2} - y^{2}}$

orbital of central metal of complex ion 'R'

TestHub · Accepted Answer

Complex P: [ C o ( CN ) 6 ​ ] 3 − . Co³⁺ is d 6 , strong field ligand (CN⁻) leads to low spin. t 2 g 6 ​ e g 0 ​ . So X = 6. Complex Q: [ N i ( CN ) 4 ​ ] 2 − . Ni²⁺ is d 8 , strong field ligand (CN⁻) leads to square planar. d x y 2 ​ d yz 2 ​ d x z 2 ​ d z 2 2 ​ d x 2 − y 2 0 ​ . So Y = 0. Complex R: [ C u ( CN ) 4 ​ ] 3 − . Cu⁺ is d 10 , tetrahedral. e 4 t 2 6 ​ . d x 2 − y 2 ​ is part of t 2 ​ . So Z = 2. ∣ X + Y − Z ∣ = ∣6 + 0 − 2∣ = ∣4∣ = 4 .

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