选项 | 陈述Ⅰ | 陈述Ⅱ | 判断 |
A | 纯碱可用于治疗胃溃疡 | 纯碱可与盐酸反应 | Ⅰ对,Ⅱ对,有 |
B | CO2中的少量HCl杂质可将气体通入饱和Na2CO3溶液除去 | Na2CO3可与HCl反应 | Ⅰ对,Ⅱ错,无 |
C | Na2CO3溶液中混有少量NaHCO3杂质,可加入适量NaOH除去 | NaHCO3可与NaOH反应生成Na2CO3 | Ⅰ对,Ⅱ对,有 |
D | 向饱和Na2CO3溶液中通入CO2气体,有白色晶体析出 | NaHCO3难溶于水 | Ⅰ对,Ⅱ对,有 |
A.A | B.B | C.C | D.D |
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