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20世纪90年代我国的硫酸产量已达到1600万吨，这标志着我国硫酸工业取得飞速发展．工业生产硫酸的主要流程为：①煅烧黄铁矿4FeS 2 +11O 2 高温 . 2Fe 2 O 3 +8SO 2 ；②SO 2 转化为SO 3 ；③用浓H 2 SO 4 吸收SO 3 请回答相关问题： （1）如何利用流程①中形成的固体剩余物：______． （2）SO 2 是一种酸性氧化物，具有与CO 2 相似的化学性质．生产中会有部分SO 2 随尾气排入大气，造成环境污染．有人设计用熟石灰吸收尾气中的SO 2 ，请写出此反应的化学方程式______． （3）第②步反应是一个化合反应，请判断实现此反应的另一反应物是______． （4）将SO 2 通入氯气的水溶液至恰好完全反应，生成两种常见的酸，请完成下列化学方程式：______．
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