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置換反應係一種元素或化合物嘅離子根同另一種離子化合物發生嘅反應,屬氧化還原反應嘅一種。響呢種反應度,還原性或氧化性比較強嘅物質會同相對較弱嘅物質進行置換。如果想知邊樣嘢會被人置換出嚟,就要睇吓金屬活性序。好似下面嘅例子咁,鐵喺活性序排得前過銅,銅喺好後,被人置換出嚟。
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