A.向试管中加入少量的CaCl2溶液,仔细观察,溶液没有颜色 |
B.向FeCl3溶液中滴加适量Ca(OH)2溶液,振荡后静置,溶液黄色消失 |
C.向FeCl3溶液中滴加适量AgNO3溶液,振荡后静置,溶液黄色未消失 |
D.向FeCl3溶液中加入适量蒸馏水,振荡后静置,溶液黄色变浅 |
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