11177 6 Which of the following is a conjugate acid-base pair for the reaction? NH3  +  H2O  ?  NH4 +  +  OH− conjugate acid conjugate base A NH3 H2O B NH3 NH4 + C H2O NH4 + D H2O OH− 7 Which titration has no suitable indicator? A 0.1 mol dm−3 HCl with 0.1 mol dm−3 NH3 B 0.1 mol dm−3 HCl with 0.1 mol dm−3 NaOH C 0.1 mol dm−3 CH3COOH with 0.1 mol dm−3 NH3 D 0.1 mol dm−3 CH3COOH with 0.1 mol dm−3 NaOH 8 Which reaction can not be used to prepare carboxylic acids? A Hydrolysis of nitriles B Hydrolysis of acyl chlorides C Oxidation of aldehydes D Oxidation of ketones