Can too much vitamin c cause protassuim defficency??

No: Vitamin C intake would not cause deficiency of potassium. Sources of vitamin C like orange juice also have potassium.

Toxicities: That are associated with too much vitamin C are abdominal bloating, diarrhea, certain types of kidney stones and rare abnormal heart rhythms. While low potassium isn't usually a direct complication, the diarrhea from too much vitamin C can lead to hypokalemia(low potassium).