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Q)

Of the following outer electronic configurations of atoms,the highest oxidation state is achieved by which one of them

$\begin{array}{1 1}(a)\;(n-1)d^5ns^2\\(b)\;(n-1)d^5ns^1\\(c)\;(n-1)d^3ns^2\\(d)\;(n-1)d^8ns^2\end{array}$

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A)
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+7 state can be achieved by give d-electrons and two s-electrons.
Hence (a) is the correct answer.
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