InterviewSolution
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InterviewSolution
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Why are Ni^(2+) compounds thermodynamically more stable than Pt^(2+) compounds while Pt^(4+) compounds are relatively more stable than Ni^(4+) compounds ? |
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Answer» Solution :The thermodynamic stability of transition metal compounds can be easily predicted from the VALUES of ionisation energies. The first four ionisation energy values of nickel and platinum are given below: `{:((E_(1)+E_(2)),E_(3)+E_(4)to,TOTAL (E_(1)+E_(2)+E_(3)+E_(4))),(Ni 2.49MJmol^(-1), 8.80 MJmol^(-1), 11.29 MJmol^(-1)),(Pt 2.66 MJmol^(-1),6.70 MJmol^(-1),9.36 MJmol^(-1)):}` From these values, it is clear that `Ni^(2+)` compounds will be thermodynamically more stable than `Pt^(2+)` compounds WHEREAS `Ni^(4+)` compounds are relatively less stable than `Pt^(4+)` compounds. |
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