DSE CHEM MASTERY : 中六 ELECTIVE 衝刺課程

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答案係 *D：(1)、(2) 同 (3)*。

(1) Na₂O(s) + H₂O(l) → 2NaOH(aq)

Na₂O₂ 同水可寫成：
Na₂O₂(s) + 2H₂O(l) → 2NaOH(aq) + H₂O₂(aq)

亦可以分兩步表示：
Na₂O₂(s) + H₂O(l) → Na₂O(s) + H₂O₂(aq)

再由 Na₂O 同水反應生成 NaOH。因此三條都可以描述反應；不過相片中第 (2) 條如果真係只寫 1 個 NaOH，就未 balance，應該係 *2NaOH*。

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