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知道智慧树答案 
1、判断题：
Ferrous oxalate reacts with saturated K2C2O4 solution to form potassium ferrioxalate (III) solution and ferric hydroxide precipitation.
选项：
A: 正确
B: 错误
答案: 【 正确】
2、判断题：
Two drops of KSCN solution were added to the potassium ferrioxalate (III) solution, and the solution turned yellow.
选项：
A: 正确
B: 错误
答案: 【 错误】
1、判断题：
When synthesizing ferrous carbonate, the pH of the solution should be controlled at 5-6 to prevent the hydrolysis of ferrous ion.
选项：
A: 正确
B: 错误
答案: 【 正确】
2、判断题：
In the experiment of preparing ferrous citrate, iron nails should be added in every step to prevent the oxidation of Fe2 +.
选项：
A: 正确
B: 错误
答案: 【 正确】
1、判断题：
Potassium nitrosodisulfonate is orange yellow or yellow brown crystal, and its aqueous solution is purple.
选项：
A: 正确
B: 错误
答案: 【 正确】
2、判断题：
Sodium bisulfite solution for the preparation of potassium nitrosodisulfonate needs to be prepared immediately before use to avoid its oxidation by air.
选项：
A: 正确
B: 错误
答案: 【 正确】
3、判断题：
The crystal of potassium nitrosodisulfonate decomposes slowly in neutral solution.
选项：
A: 正确
B: 错误
答案: 【 错误】
1、判断题：
Gluconic acid can be prepared by the reaction of calcium gluconate with concentrated sulfuric acid.
选项：
A: 正确
B: 错误
答案: 【 正确】
2、判断题：
In order to precipitate zinc gluconate crystal as soon as possible, the filtrate should be heated and concentrated on a bunsen lamp to 1 / 3 of the original volume.
选项：
A: 正确
B: 错误
答案: 【 错误】
1、单选题：
In the experiment of purification of sodium chloride, in which step can potassium ion be removed？
选项：
A: Dissolution and filtration
B: Adding barium chloride solution
C: Adding sodium carbonate solution
D: Evaporation and crystallization
答案: 【 Evaporation and crystallization】
2、单选题：
In the experiment of purification of sodium chloride, the filtrate is transferred to an evaporating dish and evaporated until the solution is in what state?
选项：
A: Boiling starts
B: Crystal film appears
C: Be a thin paste
D: Evaporate to dryness
答案: 【 Be a thin paste】
3、单选题：
What color is the precipitate produced in the identification reaction of magnesium ion?
选项：
A: Blue
B: Green
C: Brown
D: Pink
答案: 【 Blue】
4、单选题：
In what medium should the identification of calcium ion be carried out？
选项：
A: Hydrochloric acid
B: Sodium hydroxide
C: Acetic acid
D: Deionized water
答案: 【 Acetic acid】
5、单选题：
In which medium should the identification of magnesium ion be carried out?
选项：
A: Alkaline
B: Acidic
C: Neutral
D: All above
答案: 【 Alkaline】
6、判断题：
In the experiment of purification of sodium chloride, the filtrate was evaporated, concentrated and evaporated to dryness, and then the purified sodium chloride was obtained.
选项：
A: 正确
B: 错误
答案: 【 错误】
7、判断题：
When using the tray balance to weigh the reagents, the objects should be placed on the left and the weights should be placed on the right.
选项：
A: 正确
B: 错误
答案: 【 正确】
8、判断题：
In the experiment of purificatio
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