下列物质的转化在给定条件下能实现的是( )
①Al$_2$O$_3$$\xrightarrow[{"type":"string","value":"NaOH(aq)"}]{△}$NaAlO$_2$(aq)$\xrightarrow[{"type":"merge","value":[{"type":"string","value":"CO"},{"type":"script","value":{"front":"","sup":"","sub":"2"}}]}]{}$Al(OH)$_3$
②S$\xrightarrow[{"type":"merge","value":[{"type":"merge","value":[{"type":"string","value":"O"},{"type":"script","value":{"front":"","sup":"","sub":"2"}}]},{"type":"string","value":"/点燃"}]}]{}$SO$_3$$\xrightarrow[{"type":"merge","value":[{"type":"merge","value":[{"type":"string","value":"H"},{"type":"script","value":{"front":"","sup":"","sub":"2"}}]},{"type":"string","value":"O"}]}]{}$H$_2$SO$_4$
③饱和NaCl(aq)$\xrightarrow[{"type":"merge","value":[{"type":"string","value":"NH"},{"type":"script","value":{"front":"","sup":"","sub":"3"}},{"type":"string","value":",CO"},{"type":"script","value":{"front":"","sup":"","sub":"2"}}]}]{}$NaHCO$_3$$\xrightarrow[{"type":"string","value":"△"}]{}$Na$_2$CO$_3$
④Fe$_2$O$_3$$\xrightarrow[{"type":"string","value":"HCl(aq)"}]{}$FeCl$_3$(aq)$\xrightarrow[{"type":"string","value":"△"}]{}$无水FeCl$_3$
⑤MgCl$_2$(aq)$\xrightarrow[{"type":"string","value":"石灰乳"}]{}$Mg(OH)$_2$$\xrightarrow[{"type":"string","value":"煅烧"}]{}$MgO.