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Engineering
Chemistry
Important Term for Coordination Compounds
Isomerism in Coordination Compounds
Crystal Field Theory and Valence Bond Theory
Question

Choose the incorrect order of stability in following pairs of complex species.

[Cu(en)(H2O)4]2+ > [Cu(en)2(H2O)2]2+

[Cu(en)3]2+ < [Ni(en)3]2+

[Co(en)3]+3 > [Co(NO2)6]3–

[Ni(en)2(H2O)2]2+ > [Ni(en)3]2+

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Solution
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[Cu(en)(H2O)4]2+                        →  KStb  = 3 × 1010

[Cu(en)2(H2O)2]2+                     → KStb = 1 × 109

[Cu(en)3]2+                                → KStb = 0.1

[Ni(en)(H2O)4]2+                       → KStb  = 2 × 107

[Ni(en)2(H2O)2]2+                     → KStb = 1 × 106

[Ni(en)3]2+                                → KStb = 1 × 104

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