(10年云南玉溪12)下列化学方程式完全正确的是(  )A.天然气燃烧  

(10年云南玉溪12)下列化学方程式完全正确的是(  )

A.天然气燃烧             CH4+O2CO2+H2O

B.处理污水中的硫酸       Ca(OH)2+H2SO4===CaSO4+H2O

C.二氧化碳气体的检验      CO2+Ca(OH)2=CaCO3↓+H2O

D.稀硫酸除铁锈           2H2SO4+Fe2O3===2FeSO4+2H2O

 

 

答案

C

解析:略

 

相关题目

甲和乙两个物体在同一直线上运动, 它们的v-t图像分别如图
甲和乙两个物体在同一直线上运动, 它们的v-t图像分别如图的a和b所示. 在t1时刻                           (      ) A.它们的运动方向
、如图:A、B是两个蓄水池,都在河流a的同侧,为了方便灌
、如图:A、B是两个蓄水池,都在河流a的同侧,为了方便灌溉作物,要在河边建一个抽水站,将河水送到A、B两地,问该站建在河边什么地方,可使所
直线y=-x+3交x轴于点A,交y轴于点B,顶点为D的抛物线y=-x2+2m
直线y=-x+3交x轴于点A,交y轴于点B,顶点为D的抛物线y=-x2+2mx-3m经过点A,交x轴于另一点C,连接BD,AD,CD,如图所示 (1)直接写出抛物线的解析式和点A
    Today we eat on the go, at our  desks and   even    in front of co
    Today we eat on the go, at our  desks and   even    in front of computers.  We eat takeout, deliveted  and prekaged  meals.      36     “Over the past three decades, peopl
Some cameras have been installed to        those vehicles that always bre
Some cameras have been installed to        those vehicles that always break speed limits at night. A.watch over           B.look into        C.protect from       
在图所示的电路中,电源电压为6伏,滑动变阻器标有“10W  1
在图所示的电路中,电源电压为6伏,滑动变阻器标有“10W  1A”字样。闭合电键S,电流表的示数为0.5安,电压表的示数为2伏。求:(1)此时滑动变阻
-Would you please help me with my writing skills?   -__________. You can come
-Would you please help me with my writing skills?   -__________. You can come to my office every Saturday.    A. That's all right                B. Not at all    C. No problem
 ---I hear Ted got hurt badly in the car accident yesterday.  ---It’s true.
 ---I hear Ted got hurt badly in the car accident yesterday.  ---It’s true. His careless driving was the       of the accident.       A. reason               B. cause  

最新题目