问题 选择题

甲乙两种非金属,能说明甲比乙的非金属性强的是(    )

①甲比乙容易与H2化合;②甲的气态氢化物比乙的气态氢化物稳定;③甲的氧化物对应的水化物的酸性比乙的氧化物对应的水化物酸性强;④与某金属反应时甲原子得电子数目比乙的多;⑤甲的单质熔沸点比乙的低。

A.①②③

B.只有⑤

C.①②③④⑤

D.①②

答案

答案:D

题目分析:元素的非金属性越强,它与H2化合就越容易,产生的氢化物稳定性就越强,其最高价氧化物对应的水化物的酸性就越强,在化学反应中就越容易获得电子。而影响该元素的单质的熔沸点高低的与分子间作用力或化学键的强弱有关。不同类型的物质的熔沸点变化规律不同,因此甲的单质熔沸点比乙的低不能据此来判断它们的非金属性的强弱。 因此正确的说法为①②。选项为D。

多项选择题
改错题
短文改错。
     此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右
边的横线上画一个勾;如有错误(每行只有一个错误),则按下列情况改正:
此行多一个词:把多余的词作斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。
此行缺一个词:在缺词处加一个漏字符号,在该行右边横线上写出该加的词。
此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
注意:原行没有错的不要改。
     Nearly a week passed after the girl was able to explain
what happened to her. One afternoon she set out from the
coast in a small boat and were caught in a storm. Towards
evening, the boat struck a rock but the girl jumped into the
sea. Then she swam to the shore after spend the whole night
in the water. During that time she covered the distance of eight
miles. Early in next morning, she saw a light ahead. She knew
she was near the shore. In arriving at the shore, she struggled
towards the light she had seen. That was that she remembered.
When she woke up a day later, she found her in hospital.
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