Which gas is evolved?? Q. Which gas is evolved at the anode during the electrolysis of K H F 2 in anhydrous HF? (A) O 2 (B) F 2 (C) H 2 (D) H 2 a n d O 2 Share with your friends Share 0 Nisarg answered this The correct option is (B) I.e. fluorine gas is liberated at anode. 2 View Full Answer