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Question

Consider following exchange reactions :

[Fe(H2O)6]2++Cl[Fe(H2O)5Cl]++H2O [k=106M1s1]

[Ru(H2O)6]2++Cl[Ru(H2O)5Cl]++H2O [k=102M1s1]

[Where, k= rate constant]

Thus,Ru2+, like other second- and third-row transition metal ions :

A
Forms low-spin complexes.
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B
Low-spin d6 species are kinetically inert.
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C
Both of the above.
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D
None of the above.
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Solution

The correct option is B Both of the above.
Ru2+, like other second- and third-row transition metal ions forms low-spin (or spin paired) complexes.
Low-spin d6 species are kinetically inert. In other words, they have a very small rate constant. This is exemplified by the exchange reaction
[Ru(H2O)6]2++Cl[Ru(H2O)5Cl]++H2O [k=102M1s1]

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