9.
下列结论正确的是\(\rm{(}\) \(\rm{)}\)
\(\rm{①}\)粒子半径:\(\rm{K > Cl > S}\) \(\rm{②}\)氢化物稳定性:\(\rm{HF > H_{2}S > PH_{3}}\);
\(\rm{③}\)离子还原性:\(\rm{S^{2-} > Cl^{-} > Br^{-} > I^{-}}\) \(\rm{④}\)单质氧化性:\(\rm{Cl_{2} > S > Si}\);
\(\rm{⑤}\)酸性:\(\rm{H_{2}SO_{4} > HClO}\) \(\rm{⑥}\)碱性强弱:\(\rm{KOH > NaOH > Mg(OH)_{2}}\).