1.

During electrolysis of aqueous solution of Na_2SO_4 using graphite electrode .........

Answer»

CONCENTRATION of `Na_2SO_4` DECREASES. 
Concentration of `Na_2SO_4` remains CONSTANT. 
Concentration of `Na_2SO_4` INCREASES. 
Concentration of `Na_2SO_4` FIRST increases and then decreases. 

Answer :C


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