Which of the following pair will not produce dihydrogen gas?
A
Cu+HCl(dil.)
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B
Fe+H2SO4
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C
Mg+steam
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D
Na+alcohol
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Solution
The correct option is ACu+HCl(dil.) From electrochemical series we can see that oxidation potential of Cu is less than H. Hence copper is less reactive toward oxidation than Hydrogen. All the other metal have higher oxidation potential than H hence they will reduce H+ to Hydrogen gas. Cu+HCl(dil.)→No reaction