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（1）金刚石、石墨、C 60 都是碳的单质，关于它们的说法正确的是______（填序号） ①碳原子的排列不同；②化学性质相似；③物理性质相似； ④是同一种物质；⑤完全燃烧后二氧化碳；⑥都是黑色固体． （2）为了降低汽车尾气对空气的污染，可用纳米级某种氧化剂做催化剂，使尾气中的一氧化碳与氮氧化物（NO X ）反应，转化为空气中含有的两种气体（其中一种为单质），该反应的化学方程式为：______，其中NO X 发生了______（填“氧化”或“还原”）反应． （3）超临界C0 2 气体是一种与水相似，能阻燃、溶解能力强的溶剂，被称为“绿色环保溶剂”．它作为“绿色环保溶剂”的原因之一是能代替许多有害、有毒、易燃的有机溶剂，原因之二是______．
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