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(8分)【化学—化学与技术】 碘酸钾是一种白色结晶,无臭无味,酸性条件下碘酸钾是一种较强的氧化剂,与氢碘酸、二氧化硫等还原性物质作用,被还原为单质碘;在碱性介质中,碘酸钾能被氯气、次氯酸盐等氧化为高碘酸钾。碘酸钾在常温下稳定,加热至560 ℃开始分解。工业生产碘酸钾的流程如下,在反应器中发生反应的化学方程式为:6I 2 +11KClO 3 +3H 2 O=6KH(IO 3 ) 2 + 5KCl + 3Cl 2 试回答下列问题: (1)步骤①反应器发生的反应中,转移电子总数为___________; (2)步骤②中,用硝酸而不用HI,其原因可能是______________________; (3)步骤③要保持溶液微沸1小时以完全排出氯气,排出氯气的原因为________; (4)步骤⑧用氢氧化钾调节溶液的pH,反应的化学方程式为:________;
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参考答案:
举一反三
【单选题】—_______________________________ —We have three major divisions Operations, Sales and Marketing, Finance and Administration.
A.
How many departments do we have?
B.
Which division are you in?
C.
Which department shows the best?
【简答题】Interpreting has three major forms: Alternating interpretation,Consecutive interpretation and Simultaneous interpretation. List a form on their major differences.
【判断题】break语句也可以用于if体内,它可退出if语句。
A.
正确
B.
错误
【单选题】large majority of agreements in distributive bargaining are reached when the deadline is ___________.
A.
A near
B.
flexible
C.
past
D.
undefined
【单选题】As vascular plants, trees are organized into three major organs: the roots, the stems, and the leaves.
A.
Y
B.
N
C.
NG
【简答题】______ as the 'covert depression', it has three major symptoms.
【单选题】Language,______________, and culture are three major strands highly reflected in the linguistic relativity, and they are also reflected in Applied Linguistics.
A.
music
B.
thought
C.
dance
D.
paint
【单选题】There are ______ major periods in the drama of the West.
A.
Four
B.
Five
C.
Six
D.
Three
【多选题】同一个工序的加工是指()的加工。
A.
同一个机床
B.
同一批工件
C.
同一把刀
D.
一次进刀
E.
工件某些表面的连续加工
【单选题】Nigeria, a major West African country, is nearly Great Britain. [     ]
A.
three times the size as
B.
three times the size of
C.
three times as the size
D.
the size three times of
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