A.取少量试液,滴加BaCl2溶液,生成白色沉淀,再加入足量稀盐酸,沉淀不溶解 |
B.取少量试液,加入足量稀硫酸,没有明显现象,再滴加BaCl2溶液,生成白色沉淀 |
C.取少量试液,加入足量稀盐酸,没有明显现象,再滴加BaCl2溶液,生成白色沉淀 |
D.取少量试液,加入足量稀硝酸,没有明显现象,再滴加Ba(NO3)2溶液,生成白色沉淀 |
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