High purity copper metal is obtained by

High purity copper is obtained by

High purity copper is obtained by

High purity copper is obtained by

Give reasons for the following : (i) Metals can be recovered from their ores by chemical methods. (ii) High purity metals can be obtained by zone refining method. (iii) Why is sodium choride added during electrolysis of fused anhydrous magnesium chloride ? (iv) Why is chalcocite roasted and not calcinated during recovery of copper ?

In the extraction of copper the metal is obtained by the reduction of cuprous oxide with -

Each of the following statements is true only under some specific conditions. Write the condition for each sub-equation in not more than two sentences. (i) Metals can be recovered from their ores by chemical methods. (ii) High purity metals can be obtained by zone refining method.

High purity dihydrogen is obtained by electrolysing

High purity dihydrogen is obtained by electrolysing

High purity dihydrogen is obtained by electrolysing