下列说法错误的是
A.通入SO2发生反应的离子方程式:2Co3++SO2+2H2O=2Co2++SO+4H+ |
B.加入适量Na2CO3调节pH,是利用几种氢氧化物Ksp的不同来除锌 |
C.若萃取剂的总量一定,则分多次加入萃取比一次加入萃取效果更好 |
D.将含Co2+的溶液缓慢滴加到Na2CO3溶液中沉钴,以提高CoCO3的产率 |
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