实验 | 实验操作和现象 |
① | 滴加几滴酚酞溶液,溶液变红 |
② | 加入等体积0.1 NaOH溶液充分混合,无明显现象 |
③ | 加入少量溶液,产生黑色沉淀 |
④ | 加入适量NaClO溶液,有淡黄色沉淀产生 |
A.实验①溶液中: |
B.实验②所得溶液中: |
C.实验③反应后静置一段时间,上层清液中存在: |
D.实验④中反应的离子方程式: |
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