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In Mond's process following chemcial cha...

In Mond's process following chemcial changes occurs:
`underset(("Impure"))(Ni)+CO overset(330-350K)(rarr)[P]`
`[P] overset (450-470K)(rarr) underset(("Pure")) (Ni)+CO`
Coordination number of `Ni` in `[P]` is…...

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The correct Answer is:
4
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