A) \[Na+\] ethyl alcohol
B) \[Fe+\] steam
C) \[Fe+{{H}_{2}}S{{O}_{4}}\] (aq.)
D) \[Cu+HCl\] (aq.)
Correct Answer: D
Solution :
\[Cu+HCl\to \] no reaction Copper is less reactive than hydrogen. Therefore it is unable to displace hydrogen from acid. \[E_{Cu}^{0}=+0.34\]and\[E_{H}^{0}=0.00\]
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