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Question

Incorrect order of stability is:


A
[Co(ox)3]3>[Co(H2O)6]3+
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B
[PtF6]2>[NiF6]2
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C
[Ni(trien)]2+>[Ni(en)2]2+
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D
[Ni(NH3)6]2+>[Ni(dmg)2]
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Solution

The correct option is D [Ni(NH3)6]2+>[Ni(dmg)2]
1. [Co(ox)3]3 and [Co(H2O)6]3+
The first compound has chelation which makes it much more stable than the second one. Hence, the given order is correct.

2. [PtF6]2 and [NiF6]2
Pt is a 5d series element and Ni is a 3d series element. Since 5d elements have a higher CFSE than 3d elements, we can safely say that the first compound is more stable than the second one. Hence, the given order is correct.

3. [Ni(trien)]2+ and [Ni(en)2]2+
Both complexes here have chelation. However, the first one has more rings and hence it is more stable than the second one. So, the given order is correct.

4. [Ni(NH3)6]2+ and [Ni(dmg)2]
DMG leads to the formation of chelation while the same phenomenon is not observed in the first complex. Hence, the given order of stability is incorrect.

Chemistry

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