Does Zantac (ranitidine) 75 contain aluminum?

No. Generic ranitidine is c13h22n4o3s . According to the manufacturer's website additional inactive ingredients in zantac include hypromellose, magnesium stearate, microcrystalline cellulose, synthetic red iron oxide, titanium dioxide, triacetin. There is no aluminum.
No. Zantac is a histamine-type 2 blocker that helps to reduce stomach acid production in the stomach. It's generic name is ranitidine and does not contain aluminum.