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When gold is leached from an ore, the gold is present in the solution as cations. Zinc is much higher in the electromotive series than gold and is therefore thermodynamically capable of reducing gold cations to metallic gold, the zinc being converted to zinc cations. No substantial activation energy is required for this reaction, and the reaction therefore proceeds smoothly, until all the available metallic zinc has been: consumed; so thoroughly covered with deposited gold that the solution can no longer contact any of the underlying metallic zinc; and/or all the gold cations have been removed from the leachate.

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Q: Why is zinc able to displace gold that was leached from an ore?
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