（4分）氰[(CN)2]、硫氰[ (SCN)2]的化学性质和卤素很相似,化学上称_爱下问搜题

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问题填空题

（4分）氰[(CN)₂]、硫氰[ (SCN)₂]的化学性质和卤素很相似,化学上称为拟卤素.如: (SCN)₂ + H₂O =" HSCN" + HSCNO, 它们的阴离子的还原性强弱顺序为 Cl^－< Br^－ < CN^－ < SCN^－ < I^－，试写出：

(1)(CN)₂与KOH溶液反应的化学方程式 ______________________

(2)NaBr和KSCN的混合溶液中加入(CN)₂, 反应的离子方程式___________________

答案

(1) (CN)₂ + 2KOH =" KCN" + KCNO+ H₂O

(2) (CN)₂ + 2 SCN^－ ="2" CN^－ + (SCN)₂

（1）氯气和氢氧化钾反应的生成物是氯化钾、次氯酸钾和水。由于性质相似，所以非方程式为(CN)₂ + 2KOH =" KCN" + KCNO+ H₂O。

（2）金属性越强，相应阴离子的还原性越弱，所以根据阴离子的还原性强弱顺序可知， (CN)₂的氧化性强于(SCN)₂，因此反应式为(CN)₂ + 2 SCN^－ ="2" CN^－ + (SCN)₂。

单项选择题 A3/A4型题

男，63岁，晨起发现言语不清，右侧肢体活动不适，既往体健，发病后5小时体检神志清楚，血压120/80mmHg，右中枢性面瘫，舌瘫，右侧上下肢体肌力2级，右半身痛觉减退，透露CT未见异常。

病变的部位可能是（）。

A.左侧大脑前动脉

B.右侧大脑前动脉

C.左侧大脑中动脉

D.右侧大脑中动脉

E.椎—基底动脉

完形填空

阅读下列短文，掌握其大意，然后从26—50各题所给的四个选项中，选出一个最佳答案。
The use of nuclear power has already spread all over the world, However, scientists still have
not 36 on what should be done with the large 37 of waste material that tend to increase everyyear .
Most waste materials are dealr38simply by placing them39.But nuclear waste40be dealt with very carefully. It gives41dangerous radiation and it will continue to be 42for hundreds, thousands, even mil-lions of years.
How should we get rid of such waste material in a43that it will not harm the environment? Where can we safely44it? One idea is to put this45waste inside a 46 container ,47is then dropped to the deep bottom of the ocean. But some scientists believe that this way of dealing with nuclear waste could kill fish and other living things in the oceans48interfere(干扰)with their growth.. Another way49nuclear waste is to send it into space, to the sun, 50 it would be burned. Some scientists suggests suggest that this polluting material51buried thousands of meters under the52surface. Such under-ground areas must be lree53possible earthquakes. Advance id being54,But it may still be many years55this problem could be finally settled.

A．radioactive

B．to transport