Transition and Inner Transition Elements — Chemistry STD 12 — Question
Tamilnadu BoardEnglish MediumSTD 12ChemistryTransition and Inner Transition Elements3 Marks
Question
Ni (II) compounds are more stable than Pt (II) compounds. Give reason.
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Answer
1. The ionisation enthalpy values can be used to predict the thermodynamic stability of their compounds. . 2. For Nickel I.E $E_1+ I . E _2=737+1753$ $=2490 kJ mol ^{-1}$ For platinum, I. $E_1+ I . E _2=864+1791$ $=2655 kJ mol ^{-1}$ Since, the energy required to form $Ni ^{2+}$ is less than that of $Pt ^{2+}, Ni ( II )$ compounds are thermodynamically more stable than $Pt ( II )$ compounds.
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