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生产生活中应用最广泛的一种金属． （1）在酱油中加入铁强化剂，是我国为解决 （填“甲状腺肿大”，“贫血”或“骨质疏松”）而实施的项目 （2）铁元素与地壳中含量最多的元素组成化合物的化学式为 （写出一种即可）．酸钠（Na 2 FeO 4 ）是一种新型高效的净水剂，酸钠中铁元素的化合价为____． （3）常见的食品脱氧剂多为无机铁系脱氧剂，其主要成分为活性炭粉．请将下列脱氧中的主要反应的化学方程式补充完整：4Fe（OH） 2 +O 2 +2 ═4Fe（OH） 3 ，此反应的基本类型是 ．
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