(3) Cu(NO3)2 (4) CuSO4 Which of the...
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(3) Cu(NO3)2 (4) CuSO4 Which of the following cannot evolve H, from dil acid? (1) Pt (2) Zn (3) Mg (4) Pb Electrochemical Cell Commercial cells or

NEET/Medical Exams
Chemistry
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This is a good question because it is not as obvious as telling that Cu is placed above H2 in the electro-chemical series. This is because H2SO4 is an oxidizing acid and its oxidizing power has to also be taken into account. But Cu releases H2 gas only when the acid used is concentrated. In the case when the concentration is less it doesnt release.
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