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At a site, low grade copper ores are av...

At a site, low grade copper ores are avilable and Zinc and iron scraps are also avilable . Which of the two scraps would be more suitable for reducing the leached copper ore and why?

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Zinc being above iron in the electrochemical series (more reactive metal is zinc) ,the reduction will be faster in case zinc scraps are used. But zinc is costlier metal than iron. So using iron scraps will be advisable and advantageous.
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