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We have an equation in our book

$$\ce{2Cl- (aq) + 2H2O -> 2OH-(aq) + H2(g) + Cl2(g)}$$

Why does chlorine become stable if it is electronegative? Chlorine has excess of electrons, but later loses electron to become stable.

Is chlorine more stable than chloride?

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    $\begingroup$ For this process we need energy, and in this process called the chlor-alkali process, the energy is given by a electrolysis of the choride solution. $\endgroup$ – Prachurjya Biswas Dec 30 '16 at 8:07
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    $\begingroup$ For more info Read this en.wikipedia.org/wiki/Chloralkali_process $\endgroup$ – Prachurjya Biswas Dec 30 '16 at 8:07
  • $\begingroup$ @PrachurjyaBiswas Thank you. So isfree energy positive? And will chlorine be more stable in an ionic form. $\endgroup$ – Vedant Dec 30 '16 at 8:22
  • $\begingroup$ Yes the free energy of this rxn. is positive $\endgroup$ – Prachurjya Biswas Dec 30 '16 at 8:25
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Chemistry is not about finding the most stable state. In fact, a ‘most stable state’ has no meaning; it always depends on the conditions and other substances around.

Rather, chemistry is about following the pathway which leads to the greatest accessable reduction in Gibbs free energy $\Delta G$. If energy, in your case electricity, is supplied from the outside, the system’s Gibbs free energy may even be minimised by reacting towards substances with a lesser standard heat of formation.

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