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Copper can be extracted by hydrometallur...

Copper can be extracted by hydrometallurgy but not zinc. Explain why ?

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The correct Answer is:
`E_(2n^(2+))^(@) //2n=-ve, E_(cu^(+2))^(@) //cu=+ve`
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Assertion: Extraction of zinc from sphalerite ore involes the roasting followed by reduction with coke. Reason: Zinc can be extracted by hydrometallurgy.