题目内容
二氧化氮与氢氧化钠溶液反应将产生亚硝酸钠和硝酸钠的混合溶液。
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硝酸盐都容易热分解,而且在分解产物中得到的气体都是相同的。
硝酸的沸点低于水的沸点,是因为硝酸分子内形成分子内氢键,而水只形成分子间氢键。
将浓硫酸与少量KI固体混合,还原产物主要是H2S。
I. Complete the following sentences with correct prepositions.1. David is so upset. What happened _________ him?2. She has nothing to complain __________, does she?3. News that he broke the world record was quickly broadcast __________ the country.4. They are careful ___________ what they eat and exercise regularly.5. The word “write” has the same pronunciation __________ the word “right”.
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