Which of the following will not displace hydrogen?

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Solution

The correct option is D Hg
The standard reduction potentials are given below.
Element
$B a$
$P b$
$H g$
$S n$
$H_{2}$
SRP (V)
$- 2.90$
$- 0.126$
$0.79$
$- 0.136$
$0.0$

Elements having a more negative value of SRP than hydrogen can displace hydrogen.
Hence, Ba, Pb, and Sn will displace hydrogen.
Elements having a more positive value of SRP than hydrogen cannot displace hydrogen.

Hence, Hg will not displace hydrogen.

Option C is correct.

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Element	$B a$	$P b$	$H g$	$S n$	$H_{2}$
SRP (V)	$- 2.90$	$- 0.126$	$0.79$	$- 0.136$	$0.0$