The most basic oxide among $M n O, M n_{2} O_{3}, M n O_{2}$ and $M n_{2} O_{7}$ is :

M n O

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M n O_{2}

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M n_{2} O_{3}

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M n_{2} O_{7}

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Solution

The correct option is B $M n O$
In $M n O$ , $M n$ has oxidation state of $+ 2$ and is least acidic or most basic and $M n_{2} O_{7}$ has $M n$ in $+ 7$ oxidation state so it is most acidic and least basic. The basicity decreases with increasing oxidation state.

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