An element M has the electron configuration $[A r] 3 d^{5} 4 s^{2}$ . So, which of the following oxide cannot exist for element M?

M O_{2}

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M_{2} O_{3}

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M O_{4}

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M_{2} O_{7}

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Solution

The correct option is C $M O_{4}$
Element M can show upto +7 oxidation state as there are only 7 electrons in valence shell. In $M O_{4}$ M shows +8 oxidation state which is not possible.

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M O_{2}

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