A) Zn
B) Ca
C) Al
D) Hg
Correct Answer: D
Solution :
Hg does not displace.\[{{H}_{2}}\]forms acid, as it is less reactive than\[{{H}_{2}}\](lies below\[{{H}_{2}}\]in electrochemical series) or it has more reduction potential than\[{{H}_{2}}\]so it cannot reduce \[{{H}^{+}}\]to \[{{H}_{2}}.\] Hence, the correct option is [d].
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