A) Al
B) Ca
C) Zn
D) Hg
Correct Answer: D
Solution :
Hg does not displace \[{{\text{H}}_{\text{2}}}\] from acid, it is less reactive than \[{{\text{H}}_{\text{2}}}\] (lies below \[{{\text{H}}_{\text{2}}}\]in electrochemical series). It has more reduction potential than H^ so cannot reduce \[{{\text{H}}^{+}}\]to \[{{\text{H}}_{2}}.\] The reactivity series is\[\xrightarrow[\text{Reactivity decreases}]{\text{K, Na, Ca, Mg, Al, Zn, Fe, Pb, H, Cu, Hg, Ag, Au}}\]
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