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Among (a) Na(2)O (b) MgO, (c) Al(2)O(3),...

Among (a) `Na_(2)O` (b) `MgO`, (c) `Al_(2)O_(3)`, (d) `P_(2)O_(5)` (e) `Cl_(2)O_(7)` the most basic, most acidic and amphoteric oxide can be

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More negative the value of heat of formation, lesser the amount of energy left with the oxide. In this way the potential energy of the oxide is low and is more stable.
`P_(4)O_(10) gt Al_(2)O_(3) gt SiO_(2) gt MgO gt Na_(2)O gt SO_(3) gt Cl_(2)O_(7)`
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