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In the extraction of chlorine by electro...

In the extraction of chlorine by electrolysis of brine_________.

A

oxidation of `Cl^(-)` ion to chlorine gas occures

B

reduction of `Cl^(-)` ion to chlorine gas occures

C

for overall reaction `Delta G ^( ө )` has negative value

D

a displacement reaction takes place

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Following reaction takes place in the extraction of chlorine by electrolysis
`2H_(2)O(l)+2Cl^(-)(aq) to H_(2)(g)+Cl_(2)(g)+2OH^(-)(aq)`
From the above reaction it is very clear that the oxidation of `Cl^(-)` ion to chlorine gas occurs. Thus, option (a) is the correct answer.
`Delta^(@)G` for this reaction is +422J. Therefore, thermodynamically reaction is not feasible. We know that.
`Delta^(@)G=-nFE^(@)`
By using this equation value of `E^(@)` can be calculated. Thus,
`E^(@)=-(DeltaG^(@))/(nF)=-2.2V`
Therefore, for the occurance of this reaction, external potential (emf) greater than 2.2V is required. Due to this fact ( c) is not the correct option.
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Knowledge Check

  • In the extraction by electrolysis of brine. .............

    A
    oxidation of ` Cl^(-) ` ion to chlorine gas occurs
    B
    reduction of ` Cl^(- ) ` ion to chlorine gas occurs
    C
    for overall reaction ` Delta G^(@) ` has negative value
    D
    a displacement reaction takes place

  • Electrolysis of brine gives

    A
    NaOH
    B
    `H_2`
    C
    `O_2`
    D
    `Cl_2`

  • In the extraction of chlorine from brine ........... .

    A
    ` Delta G ^(@) ` for the overall reaction is negative
    B
    ` Delta G^(@) ` for the overall reaction is positive
    C
    ` E^(@) ` for overall reaction has negative value
    D
    ` E^(@) ` for overall reaction has positive value

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