5.
下列叙述正确的有几个 ( )
\(\rm{①Li}\)在氧气中燃烧主要生成\(\rm{Li_{2}O_{2}}\)
\(\rm{②}\)将\(\rm{SO_{2}}\)通入\(\rm{BaCl_{2}}\)溶液可生成\(\rm{BaSO_{3}}\)沉淀
\(\rm{③}\)将过量的\(\rm{SO_{2}}\)通入次氯酸钙溶液可生成次氯酸
\(\rm{④}\)将\(\rm{NH_{3}}\)通入热的\(\rm{CuSO_{4}}\)溶液中能使\(\rm{Cu^{2+}}\)还原成\(\rm{Cu}\)