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Q.

Aqueous NaCl solution is electrolyzed using platinum electrodes. What is the product formed at cathode?
 

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a

Na 

b

 H2 

c

 O2 

d

Cl2

answer is B.

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Detailed Solution

  • Sodium hydroxide and hydrogen are formed when sodium is transported to the central compartment and interacts with water. 
  • Sodium hydroxide, hydrogen gas, and chlorine gas are the byproducts of electrolysis of concentrated aqueous sodium chloride are Na+ and Cl- ions. 
  • 2H2O++2e→H2(g)+2OH
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