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Question 1 · Single choice · 中档
(2分)北京2022年冬奥会上,我国短道速滑队取得了良好成绩。短道速滑所用冰刀的 材料是合金。下列选项正确的是( )
A. 该合金熔点比纯铁低 B. 该合金硬度比纯铁低 C. 该合金含碳量比生铁高 D. 该合金延展性比生铁差
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Question 2 · Single choice · 中档
(2分)雪蜡是冰雪运动的重要材料,主要成分为石蜡。以下关于石蜡的说法正确的是 ( )
A. 常温下是气态 B. 易溶于水 C. 是纯净物 D. 是石油分馏产物
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Question 3 · 中档
考点: 化学式、结构式与电子式
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Question 4 · Single choice · 中档
(2分)二氧化碳在一定条件下可以转化为乙酸,下列有关二氧化碳性质的说法正确的 是( )
A. 为共价化合物 B. 为电解质 C. 为折线形分子 D. 含非极性共价键
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Question 5 · Single choice · 中档
(2分)苯是不饱和烃,但不能使溴的四氯化碳溶液褪色,是因为( )
A. 苯是非极性分子 B. 苯溶于四氯化碳 C. 苯不能发生取代反应 D. 苯中不存在烯烃典型的碳碳双键
考点: 芳香烃
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Question 6 · Single choice · 中档
A. 二氯甲烷 B. 1,1,2,2﹣四氯乙烷 C. 1,2﹣二氯乙烯 D. 乙醛
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Question 7 · Single choice · 中档
(2分)关于CH3C≡CCH3的说法错误的是( )
A. 是乙炔同系物 B. 和1,3﹣丁二烯互为同分异构体 C. 可以使酸性高锰酸钾溶液褪色 D. 1mol该物质能和3molH2加成
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Question 8 · Single choice · 中档
(2分)常温下,在pH=1的溶液中可以大量共存的是( )
A. Al3+、 、Cl ﹣ B. OH﹣、Al3+、Na+ C. Fe2+、K+、S2﹣ D. Fe2+、 、Cl ﹣
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Question 9 · Single choice · 中档
A. CO2 B. 金刚石 C. NaCl D. 氦气
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Question 10 · Single choice · 中档
A. 在纯氧中煅烧黄铁矿 B. 在高压条件下制SO 3 C. 用98%浓硫酸吸收SO3 D. 用澄清石灰水吸收尾气
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Question 11 · Single choice · 中档
(2分)下列事实不能说明C的非金属性大于Si的是( )
A. 稳定性:CH4>SiH4 B. 酸性:H2CO3>H2SiO3 C. 熔沸点:CO2<SiO2 D. CH4中C为﹣4价,SiH4中Si为+4价
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Question 12 · Single choice · 中档
(2分)制备二氧化硫并检验其性质,用铜和浓硫酸在试管中制得二氧化硫,先通到品 红溶液中,然后通到新制氯水中,最后尾气处理,下列说法正确的是( )
A. SO2是氧化产物 B. 品红溶液褪色体现SO2的漂白性 C. 新制氯水褪色体现SO2的氧化性 D. 用饱和亚硫酸钠溶液处理尾气
考点: 二氧化硫与硫的转化易错: 氧化还原顺序错误
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Question 13 · Single choice · 中档
(2分)将Mg加入稀NH4Cl溶液中,发生反应Mg+2NH4Cl═MgCl2+2NH3↑+H2↑,下 列说法正确的是( )
A. 用湿润的蓝色石蕊试纸检验NH3 B. 经过一段时间之后可能生成Mg(OH)2沉淀 C. NH3和H2均为还原产物 D. 1molMg充分反应生成22.4L气体(标准状况下)
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Question 14 · Single choice · 中档
A. SO2和CO2 B. NaOH和NaCl C. 乙烷和乙烯 D. 正戊烷和正己烷
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Question 15 · Single choice · 中档
(2分)反应X(g)→Y(g)﹣Q1,Y(g)→Z(g)+Q2,已知Q2>Q1,下列图象正 确的是( )
选项暂未收录 题目数据待补全。
考点: 焓变与吸放热反应
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Question 16 · Single choice · 中档
(2分)冰层表面摩擦力小,原因可能是其表面有一层液态水,现有一冰面面积为200 m2,液态水厚度为10﹣7m,水的密度为1g•cm﹣3,求液态水分子数( )
A. 6.69×1020 B. 1.20×1022 C. 6.69×1023 D. 1.20×1025
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Question 17 · Single choice · 中档
(2分)实验室用叔丁醇和质量分数为37%的浓盐酸制取叔丁基氯,通过分液、洗涤、 干燥、蒸馏等步骤得到精制产品。下列说法错误的是( ) 溶解性 密度 沸点 叔丁醇 易溶于水 0.775g•cm﹣3 83℃ 叔丁基氯 微溶于水 0.851g•cm﹣3 51~52℃
A. 分液:叔丁基氯在分液漏斗上层 B. 洗涤:用氢氧化钠除去酸性物质 C. 干燥:用无水氯化钙除去微量水 D. 蒸馏:通过蒸馏获得精制叔丁基氯
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Question 18 · Single choice · 中档
(2分)浓硫酸贮存罐的钝化金属保护法示意图如图,其原理是利用可钝化的金属与直 流电源相连,控制合适的电压,使金属贮存罐表面形成致密的钝化膜,以有效减缓金属 腐蚀。下列选项错误的是( )
A. 金属贮存罐可用钢制材料 B. 电子沿导线流入辅助电极 C. 贮存浓硫酸的金属罐与电源负极相连 D. 电压高到一定程度有可能会加剧腐蚀
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Question 19 · Single choice · 中档
(2分)向10mL浓度为0.1mol•L﹣1的二元弱酸H2A中逐滴加入VmL0.1mol•L﹣1的NaOH 溶液。下列离子关系错误的是( )
A. V=5,2[Na+]=[H2A]+[HA﹣]+[A2﹣] B. V=10,[H2A]+[H+]=[OH﹣]+2[A2﹣] C. V=15,且测得此时溶液pH<7,[Na+]>[A2﹣]>[HA﹣] D. V=20,[Na+]>2[HA﹣]>2[H2A]
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