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Questions  >>  CBSE XII  >>  Chemistry  >>  Electrochemistry
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Which of the following methods does not liberate hydrogen ?

$\begin{array}{1 1} Zn+H_2So_4 (dil) \\ Mg+H_2So_4 (dil) \\ Cu+H_2So_4 (dil) \\ Zn+HCl \end{array} $

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