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Q.3 Ans: (1) hydrogen, oxygen
Q.4 Ans: (4) Rajesh
hope it will help....
The correct option for the question given is
1. Hydrogen, Oxygen
This is because hydrogen is electropositive hence it will be liberated at the negative terminus of the battery whereas oxygen being electronegative will be liberated at the positive terminus of the battery during the electrolysis of acedified water using carbon electrodes.