Ncert Exercises & Solutions

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

a. $∆ G^{⊝}$ for the overall reaction is negative.

b. $∆ G^{⊝}$ for the overall reaction is positive.

c. $E^{⊝}$ for the overall reaction has a negative value.

d. $E^{⊝}$ for the overall reaction has a positive value.

Choose the correct option

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Hint: For electrolytic cell, E_cell^o value is negative.

Electrolysis of brine solution is used to extract chlorine. Overall chemical reaction occurring in this process and the value of

$∆ G^{⊝}$ can be shown as

$2 H_{2} O (l) + 2 {Cl}^{-} (aq) \to H_{2} (g) + {Cl}_{2} (g) + 2 {OH}^{-} (aq)$

For the given reaction, value of

$∆ G °$ is 422 kJ
Using

$∆ G ° = - nFE °$ , the value of

$E ° = E ° - 2.2 V$ .
Therefore,

$∆ G °$ for the overall reaction is positive and E° has negative value.

The reaction is non-spontaneous and with the help of external process, in this case electricity is an external source which is used.

With the help of electricity non-spontaneous reaction is converted into spontaneous reaction in the electrolytic cell.

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