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please solve 1st

Dear Student,

Correct answer is oxygen.

Sulphuric acid is a strong electrolyte and is fully dissociated.
H2SO4​ → 2H+ + SO4 2 -

Water is a weak electrolyte and is only slightly dissociated
H2O → H+  + OH-

Reaction at cathode:
2H+ + 2e-  →​  H2 
Hydrogen gas will be evolved, as it is lower in the electrochemical series than sodium.

Reaction at anode: 
4OH- + 4e- →  2H2O + O2  
Oxygen will be evolved  at anode.

Regards

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its not a 
options are not clear
check something burn with sulphur smell brown 
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10. The substance formed at anode is oxygen. Therefore, (b) is correct.
11. The substance formed at cathode is hydrogen. Therefore, (a) is correct
12. The substance formed at anode is oxygen which lights a glowing splint. Therefore, (b) is correct.
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