无机化学实验（英文） - 中国大学mooc
Chapter 2. Purification of Sodium Chloride
Quiz-Chapter 2. Purification of Sodium Chloride
1、In the experiment of purification of sodium chloride, in which steps can potassium ion be removed？
A、Dissolution and filtration
B、Adding barium chloride solution
C、Adding sodium carbonate solution
D、Evaporation and crystallizatio
2、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?
A、Boiling starts
B、Crystal film appears
C、Be a thin paste
D、Evaporate to dryness
3、What color is the precipitate produced in the identification reaction of magnesium ion?
A、Blue
B、Green
C、Brown
D、Pink
4、In what medium should the identification of calcium ion be carried out？
A、Hydrochloric acid
B、Sodium hydroxide
C、Acetic acid
D、Deionized water
5、In which medium should the identification of magnesium ion be carried out?
A、Alkaline
B、Acidic
C、Neutral
D、All above
6、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.
7、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.
8、In the experiment of purification of sodium chloride, 2 mol/L hydrochloric acid was used to adjust the pH of the solution to 6-7 before evaporation.
9、In the experiment of purification of sodium chloride, when barium chloride is added into the solution, white precipitate is formed, which indicates the existence of sulfate ion in the solution.
10、In the experiment of purification of sodium chloride, sulfate ions can be removed by non-toxic calcium chloride solution instead of barium chloride solution.
Chapter 3. Purification of Copper Sulfate
Quiz-Chapter 3. Purification of Copper Sulfate
1、When adding 6 mol/L ammonia to copper sulfate solution, the green precipitate appears first, then the precipitate dissolves and turns into blue solution. What is the green precipitate?
A、Copper hydroxide
B、Copper dihydroxosulphate
C、Tetraamminecopper (II) ion
D、Hexaamminecopper (II) ion
2、In the experiment of purification of copper sulfate, what pH value should be adjusted before the filtrate is evaporated and concentrated?
A、7
B、1-2
C、4
D、14
3、In the experiment of purification of copper sulfate, in order to remove iron and not reduce the yield of the product, what should be the pH value of the solution?
A、7
B、1-2
C、4
D、14
4、In the experiment of purification of copper sulfate, what solution should be used to adjust the pH of the solution？
A、Sodium hydroxide
B、Potassium hydroxide
C、Copper hydroxide
D、Copper dihydroxosulphate
5、In the copper sulfate purification experiment, if the solution in the evaporating dish turns green during evaporation, what is the reason?
A、Copper ion hydrolyzes
B、The temperature is too high
C、The impurities are not removed completely
D、The evaporation is too dry and the crystal water is lost
6、In the experiment of purification of copper sulfate, the filtrate was evaporated, concentrated and evaporated to dryness to get the purified copper sulfate.
7、In the experiment of purification of copper sulfate, the pH should be adjusted above 4 to remove iron ion.
8、Chemical reagents are usually divided into four grades according to the purity.
9、Crude copper sulfate usually contains soluble impurities such as ferrous sulfate and ferric sulfate, which can be removed by hydrolysis and filtration after adjusting pH.
10、In the experiment of purification of copper sulfate, except for ferrous ion and iron ion, other trace soluble impurities are removed by remaining in the mother liquor.
Chapter 4. Acid-Base Reaction and Buffer Solution
Quiz-Chapter 4. Acid-Base Reaction and Buffer Solution
1、What can be prepared as a buffer solution?
A、HCl and NaOH (excess)
B、HCl and NH3·H2O (excess)
C、HAc (excess) and HCl
D、NaOH and NH3·H2O (excess)
2、In general, what is the buffer solution?
A、Solution of weak acid and weak base salt
B、Solution of weak acid or weak base and its salt
C、Solution with constant pH value
D、Solution with constant ionization degree
3、What is the most important buffer pair in human plasma?
A、![]()
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B、![]()
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C、![]()
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D、![]()
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4、What is wrong with the following description of buffer solution?
A、When the temperature is constant, pKa and buffer ratio are the most important factors affecting the pH value of buffer solution.
B、After the buffer solution was diluted with water, the pH value and buffer capacity remained unchanged.
C、The effective buffer range of buffer solution is pKa±1.
D、When the buffer ratio is constant, the larger the total concentration is, the larger the buffer capacity is.
5、What pH of the standard solutions should be used for calibration when measuring acid solution with acidity meter?
A、6.86 and 4.00
B、6.86 and 9.18
C、4.00 and 9.18
D、All above
6、After diluting the buffer solution in a certain range, the pH and buffer capacity of the buffer solution remain unchanged because the ratio of [conjugated base] to [conjugated acid] remains unchanged.
7、The buffer solution can be prepared by adding a small amount of NaOH into a weak acid HB.
8、Acidity meter should be calibrated with standard solution before use.
9、Before each measurement, the electrode of the acidity meter should wash with deionized water.
10、After the measurement, the electrode of the acidity meter should be immersed in deionized water.
Chapter 5. Complexes and Precipitation-Dissolution Equilibrium
Quiz-Chapter 5. Complexes and Precipitation-Dissolution Equilibrium
1、In which of the following solutions, silver bromide precipitate is soluble?
A、Sulfuric acid
B、Silver nitrate
C、Sodium hydroxide
D、Sodium thiosulfate
2、There are four characteristics in the formation of complexes. Which of the following is wrong?
A、Color change of solution
B、Unchanged acidity and basicity
C、Solubility change of insoluble electrolyte
D、Redox change of central ion
3、What color of substance will be produced by adding a small amount of sodium thiosulfate solution to the excess silver nitrate solution?
A、White
B、Yellow
C、Black
D、Colorless
4、5 ml of deionized water was added into the lead iodide precipitation and the precipitation was dissolved. What is the reason?
A、J < KSP
B、Salt dissolution
C、Coordination dissolution
D、Common ion effect
5、Take a drop of sodium sulfide solution (0.1 mol/L) and a drop of lead nitrate solution (0.1 mol/L) into the test tube, shake the test tube, precipitate, and then add 6 mol/L nitric acid solution, shake the test tube, precipitate dissolves. What is the reason?
A、Salt effect
B、Common ion effect
C、Redox reaction
D、Coordination dissolution
6、Adding sodium chloride solution to the silver chromate precipitate, the precipitate turns white.
7、The common ion effect reduces the ionization equilibrium constant of weak electrolyte.
8、Salt effect reduces the solubility of insoluble electrolyte.
9、The silver iodide precipitation disappeared after adding a certain concentration of ammonia.
10、For different types of insoluble electrolytes, it is necessary to calculate the concentration of reagent needed to judge the order of precipitation, and the one with higher concentration of reagent precipitates first.
Chapter 6. Oxidation-reduction Reactions
Quiz-Chapter 6. Oxidation-reduction Reactions
1、What is the effect of concentration on redox reaction rate?
A、The higher the concentration, the faster the reaction rate.
B、The higher the concentration, the slower the reaction rate.
C、The lower the concentration, the faster the reaction rate.
D、The concentration had no effect on the reaction rate.
2、In the![]()
/Cu half-cell of copper zinc primary cell, after adding excessive 2mol·L-1 ammonia to produce dark blue transparent solution, the electromotive force was measured. Compared with the standard electromotive force, which of the following conclusions are correct?
A、The electromotive force increases.
B、The electromotive force decreases.
C、The electromotive force does not change.
D、It can not be determined.
3、What is the relationship between the redox capacity and the corresponding counter electrode potential?
A、The higher the electrode potential, the stronger the oxidizability of the oxidation form.
B、The lower the electrode potential, the stronger the oxidizability of the reduced form.
C、The lower the electrode potential, the stronger the oxidizability of the oxidation form.
D、The higher the electrode potential, the stronger the oxidizability of the reduced form.
4、There is no reaction when 3% hydrogen peroxide is added to 0.1 mol/L cobalt chloride solution, but the reaction occurs when 1 mol/L ammonium chloride is added, then 6 mol/L ammonia water is added, and then 3% hydrogen peroxide is added. Why?
A、When the complex is formed, the reducibility of the central atom is enhanced.
B、When ammonium chloride is added, the oxidation of hydrogen peroxide is enhanced.
C、When the complex is formed, the oxidation of the central atom is enhanced.
D、When ammonium chloride is added, the oxidation of hydrogen peroxide is weakened.
5、What is the role of hydrogen peroxide in potassium permanganate solution acidified by sulfuric acid?
A、Oxidizing sulfuric acid
B、Reducing sulfuric acid
C、Reducing potassium permanganate
D、Decomposing to produce oxygen and hydrogen
6、The electrode potential of saturated calomel electrode is equal to that of standard calomel electrode.
7、The electrode potential of saturated calomel electrode is 0.2415 V.
8、Hydrogen peroxide can be used as both oxidant and reductant. When the pH becomes lower, the reducibility of hydrogen peroxide increases.
9、The electrolyte in the salt bridge does not participate in the battery reaction.
10、After mixing 10 drops of potassium bromide solution (0.1mol/L) and 2 drops of ferric chloride solution (0.1mol/L) in the test tube, 20 drops of carbon tetrachloride were added and the layer of carbon tetrachloride changed from colorless to orange red.
Chapter 7. Properties of p-Block Elements
Quiz-Chapter 7. Properties of p-Block Elements
1、In acidic medium, ammonium molybdate reagent can be used to identify PO43- ions with the formation of the yellow precipitate.
2、AgNO3 solution acts as a catalyst in the oxidation test of persulfate.
3、Boric acid is a ternary acid.
4、The nitrous acid generated by the reaction of nitrite solution and strong base decomposes into N2O3 and H2O. The N2O3 decomposes into NO and NO2.
5、AgBr and AgI can be reduced to Ag by Zn in acetic acid medium.
6、When saturated H2S solution is added to Pb(NO3)2, the black precipitate is formed. Then the H2O2 solution (ω=0.03) is added to the above system, the precipitate turns white.
7、Under the acidic condition, KMnO4 solution can be reduced to MnO2 by H2S.
8、H2SO3 has the property of the bleaching and can discolor magenta due to the formation of colorless adducts.
9、The sodium bismuthate is khaki solid and soluble in water, and has strong oxidizing property.
10、In the experiment of the oxidizability of persulfate, the test tube can be heated directly on the gas lamp.
11、One drop of starch solution is added to a few drops of saturated iodized water. After a few drops of saturated solution of SO2 are added to the above system, the solution becomes deep blue.
12、In the experiment of checking the oxidizability of persulfate, MnSO4 must be excessive.
13、A small amount of Na2[Sn(OH)4] solution is prepared, then 0.1 mol/L BiCl3 solution is added dropwise, and no black precipitate is produced. The reason is that the amount of NaOH is not added enough.
14、The reaction between Lewis acid and glycerin can produce hydrion.
15、The lead dichloride precipitate is insoluble in cold water but soluble in hot water.
16、Both Pb2+ and Sb3+ are amphoteric.
Chapter 8. Preparation of d-Block Elements
Quiz-Chapter 8. Properties of d-Block Elements
1、A few drops of 0.1 mol/L FeSO4 solution is added in the test tube, and the solution is adjusted to the acidity with 2 mol/L HCl solution. Then 10 drops of thioacetamide solution is added. After heating in water bath, black FeS precipitation can be seen.
2、Under the acidic condition, the reduction product of MnO4- is Mn2+.
3、In the silver mirror experiment, it is better that the more ammonia water is added.
4、Zn2+ is identified by adding CCl4 solution containing diphenylthiazone to the solution, and the reaction phenomenon is that the pink chelate is formed in the CCl4 solution.
5、The newly prepared unoxidized [Cu(NH3)2]+ coordination ion is blue.
6、Under the acidic condition, the reduction product of MnO4- is MnO2.
7、Ag2O cannot dissolve in 2 mol/L NH3·H2O.
8、When the preparation of SnCl2 solution, HCl solution is often added to prevent hydrolysis.
9、Mn(OH)2, which is not oxidized, is a white solid.
10、CuI is brown yellow precipitate.
11、CrCl3 solution is gray green.
12、Cr(OH)3 is a gray green precipitate.
13、The unoxidized Fe(OH)2 is a white solid.
14、Both Cr(OH) 3 and Co(OH) 2 are amphoteric.
15、The hydroxides of Cr, Mn, Fe, Co and Ni are easily oxidized by air.
16、The complex K3[Fe (CN) 6] is commonly named as Prussian Blue.
17、When NaOH solution is added to AgNO3 solution, the final precipitate is Ag2O.
18、The characteristics reaction of the identification of Cu2+ should be performed in a dilute acetic acid medium.
Chapter 9. Preparation of Zinc-Containing Drugs
Quiz-Chapter 9. Preparation of Zinc-Containing Drugs
1、After the filtrate of ZnSO4 was evaporated, concentrated and evaporated to dryness, the purified ZnSO4 · 7H2O was obtained.
2、ZnSO4 was prepared from industrial ZnO. Fe2 + impurity in ZnSO4 solution can be directly removed by hydrolysis.
3、ZnSO4 was prepared from industrial ZnO. The impurities of Cd2 + and Ni2 + in ZnSO4 solution could be removed by Zn powder replacement method.
4、It can be concluded that the basic zinc carbonate has been completely decomposed into zinc oxide after calcined until there is no bubble in sulfuric acid test.
5、The method of testing nickel ion is to add dimethylglyoxime solution into acid solution to see if bright red precipitate is formed.
Chapter 10. Preparation of Potassium Trioxalatoferrate (III)
Quiz-Chapter 10. Preparation of Potassium Trioxalatoferrate (III)
1、When two drops of KSCN solution is added to potassium ferrioxalate (III) solution, the solution turns yellow.
2、When two drops of CaCl2 solution were added to the potassium ferrioxalate (III) solution, the solution became turbid, indicating that oxalate is in the outside of the complex.
Chapter 11. Preparation of Ferrous Citrate
Quiz-Chapter 11. Preparation of Ferrous Citrate
1、Ferrous citrate is dark green
2、In the experiment of preparing ferrous citrate, iron nails should be added in every step to prevent the oxidation of ferron ions.
Chapter 12. Preparation of potassium nitrosodisulphonate
Quiz-Chapter 12. Preparation of potassium nitrosodisulphonate
1、Potassium nitrosodisulfonate is orange yellow or yellow brown crystal, and its aqueous solution is purple.
2、Sodium bisulfite solution for the preparation of potassium nitrosodisulfonate needs to be prepared immediately before use to avoid its oxidation by air.
3、The crystal of potassium nitrosodisulfonate decomposes slowly in neutral solution.
Chapter 13. Preparation of Zinc Gluconate
Quiz-Chapter 13. Preparation of Zinc Gluconate
1、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.
2、Gluconic acid can be prepared by the reaction of calcium gluconate with concentrated sulfuric acid.
Chapter 14. Preparation of chromium (III) complexes and the determination of splitting energy
Quiz-Chapter 14. Preparation of chromium (III) complexes
1、The splitting energy of the complex can be obtained by measuring its absorption spectrum.
2、The spectrophotometer should be recalibrated every time the measuring wavelength is changed.
Quiz-Chapter 2. Purification of Sodium Chloride
1、In the experiment of purification of sodium chloride, in which steps can potassium ion be removed？
A、Dissolution and filtration
B、Adding barium chloride solution
C、Adding sodium carbonate solution
D、Evaporation and crystallizatio
2、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?
A、Boiling starts
B、Crystal film appears
C、Be a thin paste
D、Evaporate to dryness
3、What color is the precipitate produced in the identification reaction of magnesium ion?
A、Blue
B、Green
C、Brown
D、Pink
4、In what medium should the identification of calcium ion be carried out？
A、Hydrochloric acid
B、Sodium hydroxide
C、Acetic acid
D、Deionized water
5、In which medium should the identification of magnesium ion be carried out?
A、Alkaline
B、Acidic
C、Neutral
D、All above
6、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.
7、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.
8、In the experiment of purification of sodium chloride, 2 mol/L hydrochloric acid was used to adjust the pH of the solution to 6-7 before evaporation.
9、In the experiment of purification of sodium chloride, when barium chloride is added into the solution, white precipitate is formed, which indicates the existence of sulfate ion in the solution.
10、In the experiment of purification of sodium chloride, sulfate ions can be removed by non-toxic calcium chloride solution instead of barium chloride solution.
Chapter 3. Purification of Copper Sulfate
Quiz-Chapter 3. Purification of Copper Sulfate
1、When adding 6 mol/L ammonia to copper sulfate solution, the green precipitate appears first, then the precipitate dissolves and turns into blue solution. What is the green precipitate?
A、Copper hydroxide
B、Copper dihydroxosulphate
C、Tetraamminecopper (II) ion
D、Hexaamminecopper (II) ion
2、In the experiment of purification of copper sulfate, what pH value should be adjusted before the filtrate is evaporated and concentrated?
A、7
B、1-2
C、4
D、14
3、In the experiment of purification of copper sulfate, in order to remove iron and not reduce the yield of the product, what should be the pH value of the solution?
A、7
B、1-2
C、4
D、14
4、In the experiment of purification of copper sulfate, what solution should be used to adjust the pH of the solution？
A、Sodium hydroxide
B、Potassium hydroxide
C、Copper hydroxide
D、Copper dihydroxosulphate
5、In the copper sulfate purification experiment, if the solution in the evaporating dish turns green during evaporation, what is the reason?
A、Copper ion hydrolyzes
B、The temperature is too high
C、The impurities are not removed completely
D、The evaporation is too dry and the crystal water is lost
6、In the experiment of purification of copper sulfate, the filtrate was evaporated, concentrated and evaporated to dryness to get the purified copper sulfate.
7、In the experiment of purification of copper sulfate, the pH should be adjusted above 4 to remove iron ion.
8、Chemical reagents are usually divided into four grades according to the purity.
9、Crude copper sulfate usually contains soluble impurities such as ferrous sulfate and ferric sulfate, which can be removed by hydrolysis and filtration after adjusting pH.
10、In the experiment of purification of copper sulfate, except for ferrous ion and iron ion, other trace soluble impurities are removed by remaining in the mother liquor.
Chapter 4. Acid-Base Reaction and Buffer Solution
Quiz-Chapter 4. Acid-Base Reaction and Buffer Solution
1、What can be prepared as a buffer solution?
A、HCl and NaOH (excess)
B、HCl and NH3·H2O (excess)
C、HAc (excess) and HCl
D、NaOH and NH3·H2O (excess)
2、In general, what is the buffer solution?
A、Solution of weak acid and weak base salt
B、Solution of weak acid or weak base and its salt
C、Solution with constant pH value
D、Solution with constant ionization degree
3、What is the most important buffer pair in human plasma?
A、
B、
C、
D、
4、What is wrong with the following description of buffer solution?
A、When the temperature is constant, pKa and buffer ratio are the most important factors affecting the pH value of buffer solution.
B、After the buffer solution was diluted with water, the pH value and buffer capacity remained unchanged.
C、The effective buffer range of buffer solution is pKa±1.
D、When the buffer ratio is constant, the larger the total concentration is, the larger the buffer capacity is.
5、What pH of the standard solutions should be used for calibration when measuring acid solution with acidity meter?
A、6.86 and 4.00
B、6.86 and 9.18
C、4.00 and 9.18
D、All above
6、After diluting the buffer solution in a certain range, the pH and buffer capacity of the buffer solution remain unchanged because the ratio of [conjugated base] to [conjugated acid] remains unchanged.
7、The buffer solution can be prepared by adding a small amount of NaOH into a weak acid HB.
8、Acidity meter should be calibrated with standard solution before use.
9、Before each measurement, the electrode of the acidity meter should wash with deionized water.
10、After the measurement, the electrode of the acidity meter should be immersed in deionized water.
Chapter 5. Complexes and Precipitation-Dissolution Equilibrium
Quiz-Chapter 5. Complexes and Precipitation-Dissolution Equilibrium
1、In which of the following solutions, silver bromide precipitate is soluble?
A、Sulfuric acid
B、Silver nitrate
C、Sodium hydroxide
D、Sodium thiosulfate
2、There are four characteristics in the formation of complexes. Which of the following is wrong?
A、Color change of solution
B、Unchanged acidity and basicity
C、Solubility change of insoluble electrolyte
D、Redox change of central ion
3、What color of substance will be produced by adding a small amount of sodium thiosulfate solution to the excess silver nitrate solution?
A、White
B、Yellow
C、Black
D、Colorless
4、5 ml of deionized water was added into the lead iodide precipitation and the precipitation was dissolved. What is the reason?
A、J < KSP
B、Salt dissolution
C、Coordination dissolution
D、Common ion effect
5、Take a drop of sodium sulfide solution (0.1 mol/L) and a drop of lead nitrate solution (0.1 mol/L) into the test tube, shake the test tube, precipitate, and then add 6 mol/L nitric acid solution, shake the test tube, precipitate dissolves. What is the reason?
A、Salt effect
B、Common ion effect
C、Redox reaction
D、Coordination dissolution
6、Adding sodium chloride solution to the silver chromate precipitate, the precipitate turns white.
7、The common ion effect reduces the ionization equilibrium constant of weak electrolyte.
8、Salt effect reduces the solubility of insoluble electrolyte.
9、The silver iodide precipitation disappeared after adding a certain concentration of ammonia.
10、For different types of insoluble electrolytes, it is necessary to calculate the concentration of reagent needed to judge the order of precipitation, and the one with higher concentration of reagent precipitates first.
Chapter 6. Oxidation-reduction Reactions
Quiz-Chapter 6. Oxidation-reduction Reactions
1、What is the effect of concentration on redox reaction rate?
A、The higher the concentration, the faster the reaction rate.
B、The higher the concentration, the slower the reaction rate.
C、The lower the concentration, the faster the reaction rate.
D、The concentration had no effect on the reaction rate.
2、In the
A、The electromotive force increases.
B、The electromotive force decreases.
C、The electromotive force does not change.
D、It can not be determined.
3、What is the relationship between the redox capacity and the corresponding counter electrode potential?
A、The higher the electrode potential, the stronger the oxidizability of the oxidation form.
B、The lower the electrode potential, the stronger the oxidizability of the reduced form.
C、The lower the electrode potential, the stronger the oxidizability of the oxidation form.
D、The higher the electrode potential, the stronger the oxidizability of the reduced form.
4、There is no reaction when 3% hydrogen peroxide is added to 0.1 mol/L cobalt chloride solution, but the reaction occurs when 1 mol/L ammonium chloride is added, then 6 mol/L ammonia water is added, and then 3% hydrogen peroxide is added. Why?
A、When the complex is formed, the reducibility of the central atom is enhanced.
B、When ammonium chloride is added, the oxidation of hydrogen peroxide is enhanced.
C、When the complex is formed, the oxidation of the central atom is enhanced.
D、When ammonium chloride is added, the oxidation of hydrogen peroxide is weakened.
5、What is the role of hydrogen peroxide in potassium permanganate solution acidified by sulfuric acid?
A、Oxidizing sulfuric acid
B、Reducing sulfuric acid
C、Reducing potassium permanganate
D、Decomposing to produce oxygen and hydrogen
6、The electrode potential of saturated calomel electrode is equal to that of standard calomel electrode.
7、The electrode potential of saturated calomel electrode is 0.2415 V.
8、Hydrogen peroxide can be used as both oxidant and reductant. When the pH becomes lower, the reducibility of hydrogen peroxide increases.
9、The electrolyte in the salt bridge does not participate in the battery reaction.
10、After mixing 10 drops of potassium bromide solution (0.1mol/L) and 2 drops of ferric chloride solution (0.1mol/L) in the test tube, 20 drops of carbon tetrachloride were added and the layer of carbon tetrachloride changed from colorless to orange red.
Chapter 7. Properties of p-Block Elements
Quiz-Chapter 7. Properties of p-Block Elements
1、In acidic medium, ammonium molybdate reagent can be used to identify PO43- ions with the formation of the yellow precipitate.
2、AgNO3 solution acts as a catalyst in the oxidation test of persulfate.
3、Boric acid is a ternary acid.
4、The nitrous acid generated by the reaction of nitrite solution and strong base decomposes into N2O3 and H2O. The N2O3 decomposes into NO and NO2.
5、AgBr and AgI can be reduced to Ag by Zn in acetic acid medium.
6、When saturated H2S solution is added to Pb(NO3)2, the black precipitate is formed. Then the H2O2 solution (ω=0.03) is added to the above system, the precipitate turns white.
7、Under the acidic condition, KMnO4 solution can be reduced to MnO2 by H2S.
8、H2SO3 has the property of the bleaching and can discolor magenta due to the formation of colorless adducts.
9、The sodium bismuthate is khaki solid and soluble in water, and has strong oxidizing property.
10、In the experiment of the oxidizability of persulfate, the test tube can be heated directly on the gas lamp.
11、One drop of starch solution is added to a few drops of saturated iodized water. After a few drops of saturated solution of SO2 are added to the above system, the solution becomes deep blue.
12、In the experiment of checking the oxidizability of persulfate, MnSO4 must be excessive.
13、A small amount of Na2[Sn(OH)4] solution is prepared, then 0.1 mol/L BiCl3 solution is added dropwise, and no black precipitate is produced. The reason is that the amount of NaOH is not added enough.
14、The reaction between Lewis acid and glycerin can produce hydrion.
15、The lead dichloride precipitate is insoluble in cold water but soluble in hot water.
16、Both Pb2+ and Sb3+ are amphoteric.
Chapter 8. Preparation of d-Block Elements
Quiz-Chapter 8. Properties of d-Block Elements
1、A few drops of 0.1 mol/L FeSO4 solution is added in the test tube, and the solution is adjusted to the acidity with 2 mol/L HCl solution. Then 10 drops of thioacetamide solution is added. After heating in water bath, black FeS precipitation can be seen.
2、Under the acidic condition, the reduction product of MnO4- is Mn2+.
3、In the silver mirror experiment, it is better that the more ammonia water is added.
4、Zn2+ is identified by adding CCl4 solution containing diphenylthiazone to the solution, and the reaction phenomenon is that the pink chelate is formed in the CCl4 solution.
5、The newly prepared unoxidized [Cu(NH3)2]+ coordination ion is blue.
6、Under the acidic condition, the reduction product of MnO4- is MnO2.
7、Ag2O cannot dissolve in 2 mol/L NH3·H2O.
8、When the preparation of SnCl2 solution, HCl solution is often added to prevent hydrolysis.
9、Mn(OH)2, which is not oxidized, is a white solid.
10、CuI is brown yellow precipitate.
11、CrCl3 solution is gray green.
12、Cr(OH)3 is a gray green precipitate.
13、The unoxidized Fe(OH)2 is a white solid.
14、Both Cr(OH) 3 and Co(OH) 2 are amphoteric.
15、The hydroxides of Cr, Mn, Fe, Co and Ni are easily oxidized by air.
16、The complex K3[Fe (CN) 6] is commonly named as Prussian Blue.
17、When NaOH solution is added to AgNO3 solution, the final precipitate is Ag2O.
18、The characteristics reaction of the identification of Cu2+ should be performed in a dilute acetic acid medium.
Chapter 9. Preparation of Zinc-Containing Drugs
Quiz-Chapter 9. Preparation of Zinc-Containing Drugs
1、After the filtrate of ZnSO4 was evaporated, concentrated and evaporated to dryness, the purified ZnSO4 · 7H2O was obtained.
2、ZnSO4 was prepared from industrial ZnO. Fe2 + impurity in ZnSO4 solution can be directly removed by hydrolysis.
3、ZnSO4 was prepared from industrial ZnO. The impurities of Cd2 + and Ni2 + in ZnSO4 solution could be removed by Zn powder replacement method.
4、It can be concluded that the basic zinc carbonate has been completely decomposed into zinc oxide after calcined until there is no bubble in sulfuric acid test.
5、The method of testing nickel ion is to add dimethylglyoxime solution into acid solution to see if bright red precipitate is formed.
Chapter 10. Preparation of Potassium Trioxalatoferrate (III)
Quiz-Chapter 10. Preparation of Potassium Trioxalatoferrate (III)
1、When two drops of KSCN solution is added to potassium ferrioxalate (III) solution, the solution turns yellow.
2、When two drops of CaCl2 solution were added to the potassium ferrioxalate (III) solution, the solution became turbid, indicating that oxalate is in the outside of the complex.
Chapter 11. Preparation of Ferrous Citrate
Quiz-Chapter 11. Preparation of Ferrous Citrate
1、Ferrous citrate is dark green
2、In the experiment of preparing ferrous citrate, iron nails should be added in every step to prevent the oxidation of ferron ions.
Chapter 12. Preparation of potassium nitrosodisulphonate
Quiz-Chapter 12. Preparation of potassium nitrosodisulphonate
1、Potassium nitrosodisulfonate is orange yellow or yellow brown crystal, and its aqueous solution is purple.
2、Sodium bisulfite solution for the preparation of potassium nitrosodisulfonate needs to be prepared immediately before use to avoid its oxidation by air.
3、The crystal of potassium nitrosodisulfonate decomposes slowly in neutral solution.
Chapter 13. Preparation of Zinc Gluconate
Quiz-Chapter 13. Preparation of Zinc Gluconate
1、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.
2、Gluconic acid can be prepared by the reaction of calcium gluconate with concentrated sulfuric acid.
Chapter 14. Preparation of chromium (III) complexes and the determination of splitting energy
Quiz-Chapter 14. Preparation of chromium (III) complexes
1、The splitting energy of the complex can be obtained by measuring its absorption spectrum.
2、The spectrophotometer should be recalibrated every time the measuring wavelength is changed.