CBSE Class 12 Chemistry 2017 Delhi Set 1 Solved Paper

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Question : 17
Total: 26
(a) Write the principle of method used for the refining of germanium.
(b) Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth flotation process ?
(c) What is significance of leaching in the extraction of aluminium ?
Solution:  
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