(C) $NH_4OH$ is a weak base because it undergoes partial dissociation in aqueous solution,producing a low concentration of $OH^{-}$ ions compared to s

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(C) $NH_4OH$ is a weak base because it undergoes partial dissociation in aqueous solution,producing a low concentration of $OH^{-}$ ions compared to strong bases like $NaOH$,$KOH$,and $Ca(OH)_2$,which dissociate completely. Therefore,$NH_4OH$ is the weakest base among the given options.