Question

A substance that forms hydroxide ions in a water solution is a base true or false

Answer 1

Literally on apex it says a Bass is a substance that forms hydroxide ions in water solution

Answer 2

According to Arrhenius definition of acid bases: An acid donates $H^{+}$ ions in aqueous solution and a base donates hydroxide $OH^{-}$ ions in aqueous solution.

So the given statement that a substance that forms hydroxide ions in aquoeus solution is true.

Example of a base giving hydroxide ions in water:

$NaOH (aq) ---> Na^{+}(aq) + OH^{-}(aq)$