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Number of oxides which is/are more basic...

Number of oxides which is/are more basic as compared to `Na_(2)O`.
`Li_(2)O, K_(2)O, Cs_(2)O, Rb_(2)O, MgO`

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The correct Answer is:
`003`
`K_(2)O, Cr_(2)O, Rb_(2)O`
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GRB PUBLICATION-PERIODIC TABLE-Subjective Type
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