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NTA Abhyas NEET2020ChemistryElectrochemistryPractice

A dilute aqueous solution of N a 2 S O 4 is electrolyzed using platinum electrodes. The products at the anode and cathode are :

Options

  1. AS 2 O 8 2 − , H 2
  2. BS 2 O 8 2 − ,     N a
  3. CO 2 ,     N a
  4. DO 2 , H 2

Correct answer

D. O 2 , H 2

Step-by-step solution

H 2 O is more readily reduced at cathode than N a + . It is also more readily oxidized at anode than S O 4 2 − . Hence, the electrode reactions are 2 H 2 O + 2 e − → H 2 ↑ + 2 O H − [ a t c a t h o d e ] H 2 O → 1 2 O 2 ↑ + 2 H + + 2 e − [ a t a n o d e ]

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