A.可用如下方法除去污水中的Hg2+: FeS(s)+ Hg2+(aq)=HgS(s)+Fe2+(aq) |
B.当溶液pCl保持在1,pH在6~8时,汞元素主要以HgCl42-形式存在 |
C.HgCl2是一种强电解质,其电离方程式是:HgCl2=HgCl++Cl- |
D.当溶液pH保持在5,pCl由2改变至6时.可使HgCl2转化为Hg(OH)2 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2