题干

某无色溶液中可能含有Na+、K+、Fe3+、NH4+、Cu2+、SO42、SO32、CO32、Cl、Br这几种离子中的若干种,依次进行下列实验,观察到的现象记录如下:
①pH试纸检验,溶液的pH>7。
②取少量原溶液,向溶液中加入过量的BaCl2和盐酸的混合溶液,无白色沉淀生成。
③另取少量原溶液,向溶液中滴加足量氯水,无气体产生,再加入CCl4振荡,静置后
CCl4层呈橙色,用分液漏斗分液。
④向分液后的水溶液中加入Ba(NO32溶液和HNO3溶液,有白色沉淀产生,过滤。
⑤在滤液中加入AgNO3和HNO3的混合溶液有白色沉淀产生。
则关于原溶液的判断中不正确的是(   )

A:肯定不存在的离子是Fe3+、Cu2+、NH4+、SO42、CO32

B:肯定存在的离子是Na+、K+、SO32、Br

C:无法确定原溶液中是否存在Cl

D:若步骤④改用BaCl2溶液和盐酸的混合溶液,则对溶液中离子的判断无影响

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答案(点此获取答案解析)

B

同类题5

根据短文理解,选择正确答案。

Dear Liz,

    My stay in Thailand has certainly been the experience of my life.

    Life is busy and exciting.Bangkok is just like any other big city with a population of 10  million and heavy traffic.I'm very lucky because my host family is in a nice quiet area outside the city.There are Mr. and Mrs. Phairat, their son Sanan, who is 18, the daughter Chinda, who is 16, and Grandpa and Grandma.

    I go to an international school with Sanan and Chinda.The school teaches about 70 percent in English,and 30 percent in Thai. I've learned some spoken language,but Thai writing is very difficult.The cooking lesson is my favourite.I'm learning all about Thai food and culture People don't use chopsticks here,but spoons and forks.When I come back,I'm going to cook you a real Thai meal.

    Last weekend we visited some temples.We also drove to Pattaya beach near Bangkok.I thought it was great,but Sanan and Chinda say that next month they're taking me to Phuket  Island,where the beaches are even more beautiful.The month after next,we're going to travel to Mr.Phairat's hometown in the north of Thailand.The Phairats own land there,and they have two elephants.I'm going to ride those elephants — and even wash them.Sanan and  Chinda say it's really fun.I'm amazed by everything in this country,especially by the elephants.Elephants are an  important pan of Thai culture and way of life.They have been a traditional symbol(象征)of Thailand for many years in times of war and peace.In the seventh century,a Thai king trained 20,000 elephants for battle.

    I'll tell you all about my Thai boxing(拳击)lessons next time I write.

Love,

Mandy