[" metal oxides in the process of extrac...

[" metal oxides in the process of extraction of metal from them? "],[" 40.Generally,when metals are treated with mineral acids,hydrogen "],[" gas is liberated but when metals (except Mn and Mg),treated with "],[HNO_(3)," hydrogen is not liberated,why? "]

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[" metal oxides in the process of extraction of metal from them? "],[" 40.Generally,when metals are treated with mineral acids,hydrogen "],[" gas is liberated but when metals (except Mn and Mg),treated with "],[HNO_(3)," hydrogen is not liberated,why? "]

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