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Sodium chloride solution is electrolysed...

Sodium chloride solution is electrolysed using platinum electrodes.
a) Write the chemical equation of the reaction at cathode.
b) What happens when phenolphthalein is added to the solution? State the reason?

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a) `2H_2 O + 2e^- rarr H_2 + 2OH^-`
b) Colour turns pink Presence of sodium hydroxide in the solution
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