本课配套习题挑战模式1/5
单选题
难度系数:
1.下列物质中,能使无色酚酞试液变红的是
A: 水 |
B: 氯化钠溶液 |
C: 澄清石灰水 |
D: 稀硫酸 |
一次做对,真牛!
+5奖励规则>
- 提示1:56Kx5oCn54mp6LSo5Y+v5Lul5L2/5peg6Imy6YWa6YWe6K+V5ray5Y+Y57qi
- 答案:Qw==
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本课配套习题挑战模式2/5
单选题
难度系数:
2.能使紫色石蕊变红的物质是
A: 纯碱 |
B: 小苏打 |
C: 碳酸钙 |
D: 白醋 |
一次做对,真牛!
+5奖励规则>
- 提示1:6YW45oCn54mp6LSo6IO95L2/57qi6Imy55+z6JWK5Y+Y57qi
- 答案:RA==
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
本课配套习题挑战模式3/5
单选题
难度系数:
3.向盛有1ml稀盐酸的试管中滴入2滴紫色石蕊试液,再逐滴加入氢氧化钠溶液,边滴加边振荡,一直到氢氧化钠溶液过量.试管内溶液的颜色变化情况是
A: 无色、红色、紫色、蓝色 |
B: 无色、蓝色、紫色、红色 |
C: 无色、蓝色、紫色、无色 |
D: 无色、红色、紫色、无色 |
一次做对,真牛!
+5奖励规则>
- 提示1:57Sr6Imy55+z6JWK6K+V5YmC6YGH6YW45Y+Y57qi6Imy77yM6YGH56Kx5Y+Y6JOd6Imy44CC
- 答案:QQ==
55uQ6YW45piv5peg6Imy55qE5rq25ray77yb57Sr6Imy55+z6JWK6K+V5ray5LiO55uQ6YW45Y+Y57qi77yM6YGH5Yiw5rCi5rCn5YyW6ZKg5Y+Y6JOd77yM6YGH5Yiw5Lit5oCn5rq25ray5LiN5Y+Y6Imy77ybPGJyPuaVheacrOmimOmAiUHvvI4=
本课配套习题挑战模式4/5
单选题
难度系数:
4.将某盐酸与氢氧化钠溶液混合后,向其中滴加紫色石蕊试液,溶液变红,下列说法不正确的是
A: 混合后溶液的pH<7 |
B: 混合后溶液为氯化钠溶液 |
C: 混合后溶液的质量是混合前两种溶液的质量之和 |
D: 混合后溶液中水的质量大于混合前两种溶液中水的质量之和 |
一次做对,真牛!
+5奖励规则>
- 提示1:6IO95L2/57Sr6Imy55+z6JWK6K+V5ray5Y+Y57qi77yM6K+B5piO5rq25ray5ZGI6YW45oCn44CC
- 提示2:55uQ6YW45LiO5rCi5rCn5YyW6ZKg5Y+N5bqU77yM5Lqn54mp5Li65rCv5YyW6ZKg5ZKM5rC044CC5L2G5rCv5YyW6ZKg5ZGI5Lit5oCn44CC
- 答案:Qg==
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本课配套习题挑战模式5/5
单选题
难度系数:
5.小华将一张滤纸在某指示剂中浸泡后晾干,用蘸有氢氧化钠溶液的玻璃棒在上面写 “化学”两字,立刻显红色。再将其悬挂于铁架台上,并在滤纸的下方(如图)放置一盛有某溶液的烧杯,过一会儿,发现红色的字消失,则滤纸上的指示剂和烧杯中的溶液分别是
A: 酚酞试液;浓氨水 |
B: 酚酞试液;浓盐酸 |
C: 石蕊试液;浓氨水 |
D: 石蕊试液;浓盐酸 |
一次做对,真牛!
+5奖励规则>
- 提示1:6YWa6YWe6YGH56Kx5pi+57qi6Imy
- 提示2:54On5p2v5Lit55qE6K+V5YmC6KaB5ruh6Laz5Lik54K577ya5LiA5piv6YW45oCn77yM5LqM5piv5oyl5Y+R5oCn44CC
- 答案:Qg==
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