Question

Nh3is termed as a base though it does not contain oh-ions why

Answer 1

NH3 or ammonia is a base because when dissolved in water it forms ammoniam hydroxide which is a base

                       NH3 + H2O gives   NH4OH

the above equation satistsfies the statement

Answer 2

because it releases small amount of oh- ions in water  which is reason for its basic characteristics