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In the electrolysis of aqueous sodium chloride with inert electrodes the products obtained at anode and cathode respectively are

Options

  1. AC l 2 and N a
  2. BO 2 and N a
  3. CC l 2 and H 2
  4. DN a and C l 2

Correct answer

C. C l 2 and H 2

Step-by-step solution

In the electrolysis of aqueous sodium chloride with inert electrodes, the products obtained at anode and cathode respectively are C l 2 and H 2 . The solution contains four ions N a + , C l - , H + , O H . Following reaction takes place: At cathode N a + a q + e - → N a s ; E N a + / N a - = - 2.71 V 2 H 2 O l + 2 e - → H 2 g + 2 O - H a q ; E H 2 O / H 2 o = - 0.83 V At anode 2 C l - a q → C l 2 g + 2 e - ; E C l - / C l 2 o = - 1.36 V 2 H 2 O 2 l → O g + 4 H + a q + 4 e - ; E H 2 O / O 2 o = - 1.23 V E H 2 O / H

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