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【简答题】
某化学小组欲探究铁及其化合物的氧化性和还原性，请回答下列问题： （1）除胶头滴管外，你认为本实验必不可缺少的一种玻璃仪器是 。 （2）请帮他们完成以下实验报告： 实验目的：探究铁及其化合物的氧化性和还原性。 试剂：铁粉、FeCl 3 溶液、FeCl 2 溶液、氯水、锌片、铜片。 实验记录（划斜线部分不必填写）： 序号 实验内容 实验现象 离子方程式 实验结论 ① 在FeCl 2 溶液中滴入适量氯水 溶液由浅绿色变为棕黄色 Fe 2+ 具有还原性 ② 在FeCl 2 溶液中加入锌片 Zn＋Fe 2+ ＝Zn 2+ ＋Fe ③ 在FeCl 3 溶液中加入足量铁粉 Fe＋2Fe 3+ ＝3 Fe 2+ Fe 3+ 具有氧化性 ④ Fe 3+ 具有氧化性 实验结论： 。 （3）根据以上结论判断，下列物质中既有氧化性，又有还原性的有： 。（填序号） A．Cl 2 B．Na C．Na + D．Cl － E．SO 2 F．NO 2 （4）亚铁盐在溶液中易被氧化，而实验室中需要纯净的亚铁盐溶液。那么保存亚铁盐溶液时应该如何防止亚铁盐被氧化 。
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【简答题】agreement to resell
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【单选题】Which of the following is included within the scope of the secured transactions article of the code?
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A landlord's lien.
B.
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