Question

An alkali which completely dissociates into ions is _ (ammonium hydroxide, calcium hydroxide, lithium hydroxide)

Answer 1

Lithium hydroxide will dissociate completely .....

Answer 2

An alkali which dissociates completely in ions are both "calcium hydroxide and lithium hydroxide".

Explanation:

An alkali which dissociates completely in ions are both calcium hydroxide and lithium hydroxide as they come in the category of strong acids.

Among these two lithium hydroxide has greater efficiency to dissociates to give $OH^{-}$ ions to the greater extent.

On the other hand ammonium hydroxide is a base hence is not completely dissociates in water to give $OH^{-}$ ions.