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The no. of species having a megnetic of ...

The no. of species having a megnetic of zero among `Zn^(+2) , Cr^(+5) , Mn^(+2) , Fe^(+3), Sc^(+3)Mn^(+7), Ni^(+2)`

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The correct Answer is:
3
`Zn^(+2) ,Se^(+3), Mn^(+7)`
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