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NCERT Class XII Chemistry
Chapter - General Principle of Process of Isolation of Elements
Questions with Solutions

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Question : 19 of 31
Marks: +1, -0
How is leaching carried out in case of low grade copper ores?
Solution:  
The leaching of the low grade copper ores is carried out withacids in the presence of air when copper goes into solution as Cu2+^{2+} ions.
Therefore,
2Cu(s)+2H2SO4(aq)+O2(q)→2CuSO4(aq)+2H2O(l)2\mathrm{Cu}_{(s)}+2\mathrm{H}_2\mathrm{SO}_{4(aq)}+\mathrm{O}_{2(q)}\rightarrow 2\mathrm{CuSO}_{4(aq)}+2\mathrm{H}_2\mathrm{O}_{(l)}
or Cu(s)+2H(aq)++12O2(g)→Cu(aq)2++H2O(l)\mathrm{Cu}_{(s)}+2\mathrm{H}_{(aq)}^{+}+\frac{1}{2}\mathrm{O}_{2(g)}\rightarrow\mathrm{Cu}_{(aq)}^{2+}+\mathrm{H}_2\mathrm{O}_{(l)}
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