It is a base
Barium hydroxide, Ba(OH)2, is a base.
Barium Sulfate (BaSO4) is neither an acid nor a base it is a salt
Barium Oxide
Cyanides are weak bases when dissolved in water pKb=4.8
BaF2 is neither an acid nor a base. It is a salt formed from the reaction between barium hydroxide (a base) and hydrofluoric acid (an acid).
Aluminium oxide is an amphoteric substance, meaning it can react with both acids and bases, such as hydrochloric acid and sodium hydroxide, acting as an acid with a base and a base with an acid, neutralising the other and producing a salt.
Barium hydroxide, Ba(OH)2, is a base.
Barium Sulfate (BaSO4) is neither an acid nor a base it is a salt
Barium iodide is neither an acid nor a base. It is a salt composed of a metal (barium) and a nonmetal (iodine).
Barium oxide is formed from barium and oxygen.
Barium Oxide
Cyanides are weak bases when dissolved in water pKb=4.8
Barium can form both barium peroxide (BaO2) and barium oxide (BaO) depending on the conditions. Barium peroxide is formed when barium reacts with oxygen in excess. Barium oxide is commonly formed when barium reacts with oxygen in limited supply or at high temperatures.
Acid
acid.
BaF2 is neither an acid nor a base. It is a salt formed from the reaction between barium hydroxide (a base) and hydrofluoric acid (an acid).
Barium fluoride can be considered to be the salt of barium hydroxide (a weak base) and HF (a strong acid). And a solution of BaF2 will be weakly acidic.