A) \[L{{i}^{+}}\]
B) \[S{{r}^{2+}}\]
C) \[A{{l}^{3+}}\]
D) \[A{{g}^{+}}\]
Correct Answer: D
Solution :
Key Idea: The elements which are below\[{{H}_{2}}\]in electrochemical series, cannot displace\[{{H}_{2}}\], \[\because \]Out of\[L{{i}^{+}},S{{r}^{2+}},A{{l}^{3+}}\]and\[A{{g}^{+}},A{{g}^{+}}\]is below \[{{H}_{2}}\]in electrochemical series. \[\therefore \]\[A{{g}^{+}}\]cannot displace\[{{H}_{2}}\]
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