File:Experimental Procedure to the synthesis of (a) pure SnO2 and (b) Cu-SnO2.jpg
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![File:Experimental Procedure to the synthesis of (a) pure SnO2 and (b) Cu-SnO2.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Experimental_Procedure_to_the_synthesis_of_%28a%29_pure_SnO2_and_%28b%29_Cu-SnO2.jpg/641px-Experimental_Procedure_to_the_synthesis_of_%28a%29_pure_SnO2_and_%28b%29_Cu-SnO2.jpg?20190129232017)
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