The type of reaction that occur when 50 ml quantities of Ba(OH)2 and H2SO4 are combined is neutralization reaction
Neutralization is type of chemical reaction occurs when srong acid and strong base react to form salt and water. Ba(OH)2 is the base in this case while H2SO4 is the acid H2SO4 produces H^+ while Ba(OH)2 produces OH^- to generate water.