page 03 4. Which line in the table is correct for transition metal catalysts? Heterogenous catalyst Homogeneous catalyst A adsorption onto active sites same state as reactants B full d subshell different state to reactants C same state as reactants can change oxidation state D different state to reactants adsorption onto active sites 5. The titration curve above shows how the pH changes when a A weak acid is added to a strong alkali B strong alkali is added to a weak acid C strong acid is added to a weak alkali D weak alkali is added to a strong acid. 6. Which line in the table is correct for an acidic buffer? Species absorbing excess H3O+ ions Species providing H3O+ ions A weak base conjugate acid B conjugate base conjugate acid C weak base weak acid D conjugate base weak acid [Turn over volume added pH 14 12 10 8 6 4 2 0