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In how many of the following non-metal s...

In how many of the following non-metal showns -3 oxidation state ?
`Ca_(3)N_(2),Ca_(3)P_(2),Na_(3)As,Zn_(3)Sb_(2),Mg_(3)Bi_(2),NaN_(3),Ba(N_(3))_(2),Mg_(3)N_(2)`

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The correct Answer is:
`0006`
`Ca_(3)N_(2),Ca_(3)P_(2),Na_(3)As,Zn_(3)Sb_(2),Mg_(3)Bi_(2),Mg_(3)N_(2)`
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