下列说法正确的是(    )A.SO2能使FeCl3、KMnO4水溶液迅速褪色B.可以用

下列说法正确的是(    )

A.SO2能使FeCl3、KMnO4水溶液迅速褪色

B.可以用澄清石灰水鉴别SO2和CO2

C.硫粉在过量的纯氧中燃烧可以生成SO3

D.少量SO2通过浓的CaCl2溶液能生成白色沉淀

答案

解析:SO2中硫为+4价,具有较强的还原性。在水溶液中SO2可以将氧化剂FeCl3、KMnO4等迅速还原而使溶液褪色;SO2通入澄清的石灰水跟CO2通入澄清石灰水反应现象类似;通常情况下SO2很难被氧气氧化,只有在一定温度和催化剂存在的条件下才反应生成SO3,且是可逆反应;SO2的水化物是H2SO3,H2SO3的酸性比盐酸弱,不能生成白色沉淀。

答案:A

相关题目

--- Did you go Dutch after that meal, I mean, with the other five friends?   -
--- Did you go Dutch after that meal, I mean, with the other five friends?   --- ______.   A. Yes, they did          B. Yes, they paid for the meal   C. No, they didn’t       D.
----- I’d like to invite you to dinner this Saturday, Mr smith. -----________.
----- I’d like to invite you to dinner this Saturday, Mr smith. -----________.A. Oh, no. Let’s notB. I’d rather stay at homeC. I’m very sorry, but I have other plansD. Oh, no. That’ll be too
The cause of charity in China has yet to _______, as some wealthy Chinese fear g
The cause of charity in China has yet to _______, as some wealthy Chinese fear generous donations could invite unwanted attention on their fortunes. A. take off                   
工业上利用硫酸渣(含Fe2+、Fe3+的硫酸盐及少量CaO和MgO)制备
工业上利用硫酸渣(含Fe2+、Fe3+的硫酸盐及少量CaO和MgO)制备高档颜料铁红(Fe2O3)和回收(NH4)2SO4,具体生产流程如下: (注:铵黄铁矾化学式为(N
Our lifestyles today are very busy. We have family, school, sports, entertainme
Our lifestyles today are very busy. We have family, school, sports, entertainment and social activities to fit into a time that seems never enough. We need to be healthy to meet the demands of dail
下列不能做组织培养材料的是( )。 A叶片   B茎尖   C花
下列不能做组织培养材料的是( )。 A叶片   B茎尖   C花粉   D导管
题目:《等》 你所选的文体是() 要求:(1)写记叙文或议论
题目:《等》 你所选的文体是() 要求:(1)写记叙文或议论文。(2)立意自定。(3)不少于800字。(4)不得抄袭,不得套作。⑸必须注明所选的文体。
 Nobody knows how he was murdered,but________people behind the scenes can gu
 Nobody knows how he was murdered,but________people behind the scenes can guess why. A. a great deal of            B. a good many C. a good amount of         D. a great many

最新题目