3. Is this compound an acid or a base: Ga^+3 base neither both acid

The compound $Ga^{+3}$ is neither an acid nor a base. It is a cation of gallium, which is a metal. Acids are substances that can donate a proton (H+), while bases are substances that can accept a proton. $Ga^{+3}$ does not have the ability to donate or accept a proton, so it is neither an acid nor a base.