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Solution


Q.

On electrolysis of dil. sulphuric acid using platinum (Pt) electrode, the product obtained at anode will be          [2020]
1 hydrogen gas  
2 oxygen gas  
3 H2S gas  
4 SO2 gas  

Ans.

(2)

During electrolysis of dilute sulphuric acid the following reaction takes place at anode:

2H2O(l)→O2(g)+4H(aq)++4e-;  Ecell∘=+1.23 V

i.e., O2(g) will be liberated at anode.