Extraction of Metals - Result Question 90
####93. Each of the following statement is true, only under some specific conditions. Write the condition for each subquestion in not more than 2 sentences. (i) Metals can be recovered from their ores by chemical methods
(ii) High purity metals can be obtained by zone refining method.
(1984, 2M)
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Solution:
- (i) If the metal is moderately electropositive, e.g.
or , they can be obtained from their ore by chemical reduction methods. However, if the metal is highly electropositive, e.g. etc., no reducing agent exist for reduction of their ions and they are obtained by electrolytic reduction of their molten salt.
(ii) Metals like