A.某无色溶液中可能大量存在H+、Cl-、MnO4- |
B.pH=2的溶液中可能大量存在Na+、NH4+、SiO32- |
C.Fe2+与H2O2在酸性溶液中的反应:2Fe2++H2O2+2H+=2Fe3++2H2O |
D.稀硫酸和Ba(OH)2溶液反应:H++SO42-+Ba2++OH-=BaSO4↓+H2O |
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