Question

Which of the following will not displace hydrogen?

A

Ba

B

Pb

C

Hg

D

Sn

Medium

Solution

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Correct option is C)

The standard reduction potentials (SRP) in volts (V) are given below.

Element
      
         
       
     
       
SRP (V)

         
             

       

In the reactivity series elements having a more negative value of SRP than hydrogen, they can displace hydrogen. That means those elements are more reactive than 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 is correct.

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