填空题 下列各组反应哪几组是可逆反应？为什么？
(1)2H2+O2![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/o2xu20dinul.gif\" style=\"vertical-align:middle;\">2H2O与2H2O![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/isvc3kxxd5s.gif\" style=\"vertical-align:middle;\">2H2↑+O2↑
(2)NH3+H2O====NH3·H2O与NH3·H2O====![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/pnkuaihge54.gif\" style=\"vertical-align:middle;\">+OH-
(3)CaCO3(s)====CaCO3(aq)与CaCO3(aq)====CaCO3(s)
(4)![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/pnkuaihge54.gif\" style=\"vertical-align:middle;\">+OH-====NH3·H2O与NH3·H2O====![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/pnkuaihge54.gif\" style=\"vertical-align:middle;\">+OH-
(5)2NH3![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/40fz3u4ykbe.jpg\" style=\"vertical-align:middle;\">3H2+N2与N2+3H2![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/fo4qjv20qou.jpg\" style=\"vertical-align:middle;\">2NH3
(6)SO2+H2O====H2SO3与H2SO3====SO2+ H2O
(7)2SO2+O2![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/mcgxuaccy1i.gif\" style=\"vertical-align:middle;\">2SO3与2SO3![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/mcgxuaccy1i.gif\" style=\"vertical-align:middle;\">2SO2+O2
(8)2HI![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/qfsctwdf1op.gif\" style=\"vertical-align:middle;\">H2↑+I2↑与H2+I2![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/qfsctwdf1op.gif\" style=\"vertical-align:middle;\">2HI
填空题 下列各组反应哪几组是可逆反应？为什么？
(1)2H2+O2![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/o2xu20dinul.gif\" style=\"vertical-align:middle;\">2H2O与2H2O![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/isvc3kxxd5s.gif\" style=\"vertical-align:middle;\">2H2↑+O2↑
(2)NH3+H2O====NH3·H2O与NH3·H2O====![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/pnkuaihge54.gif\" style=\"vertical-align:middle;\">+OH-
(3)CaCO3(s)====CaCO3(aq)与CaCO3(aq)====CaCO3(s)
(4)![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/pnkuaihge54.gif\" style=\"vertical-align:middle;\">+OH-====NH3·H2O与NH3·H2O====![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/pnkuaihge54.gif\" style=\"vertical-align:middle;\">+OH-
(5)2NH3![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/40fz3u4ykbe.jpg\" style=\"vertical-align:middle;\">3H2+N2与N2+3H2![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/fo4qjv20qou.jpg\" style=\"vertical-align:middle;\">2NH3
(6)SO2+H2O====H2SO3与H2SO3====SO2+H2O
(7)2SO2+O2![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/mcgxuaccy1i.gif\" style=\"vertical-align:middle;\">2SO3与2SO3![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/mcgxuaccy1i.gif\" style=\"vertical-align:middle;\">2SO2+O2
(8)2HI![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/qfsctwdf1op.gif\" style=\"vertical-align:middle;\">H2↑+I2 91exam .org↑与H2+I2![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060705/qfsctwdf1op.gif\" style=\"vertical-align:middle;\">2HI
本题答案：(3)、(4)、(5)、(6)、(7)、(8)
本题解析：可逆反应必须强调“相同条件下”，同时可逆反应永远不能进行到底，存在平衡状态，并且有些不可逆反应在某一条件下可能变为可逆反应。
本题所属考点：【反应速率与平衡的有关计算】
本题难易程度：【简单】
A boisterous horse must have a boisterous bridle. 烈马要套上好辔头。
