Which is the most basic of the following? (a) \( \mathrm{Na}_{2} \m...

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Which is the most basic of the following?
(a) \( \mathrm{Na}_{2} \mathrm{O} \)
(b) \( \mathrm{BaO} \)
(c) \( \mathrm{As}_{2} \mathrm{O}_{3} \)
(d) \( \mathrm{Al}_{2} \mathrm{O}_{3} \)
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