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  4. H2 cannot be displaced by :

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Q. $ H_2 $ cannot be displaced by :

UPSEEUPSEE 2005

Solution:

The elements which are below $H _{2}$ in electrochemical series, cannot displace $H _{2}$,

$\because$ Out of $Li ^{+}, \,Sr ^{2+},\, Al ^{3+}$, and $Ag ^{+}, \,Ag ^{+}$ is below $H _{2}$ in electrochemical series.

$\therefore \, Ag ^{+}$ cannot displace $H _{2}$