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Electrolysis — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryElectrolysis1 Mark
Question
Explain the following :
When a dilute aqueous solution of sodium chloride is electrolysed between platinum electrodes, hydrogen gas is evolved at the cathode but metallic sodium is not deposited. Why?
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Answer

Since hydrogen is much below sodium in the activity series, hydrogen is discharged at the cathode in preference to sodium.

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