Addition of \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) to a solution of ...

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Addition of \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) to a solution of an oxide in water produces \( \mathrm{CO}_{2} \). This experiment indicates that :
(a) the oxide is basic
(b) the oxide is amphoteric
(c) the oxide is that of a metal
(d) the oxide is that of a non-metal
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