1.The following speculations are unreasonable ( ).
a.Under the same conditions, the reaction between BR2 and PBR3 is more difficult than that of Cl2 with PCL3.
b.OpbrCl2 reacts with a sufficient amount of H2O to form 2 acids.
c.Under the same conditions, the order of reaction with water from fast to slow: opbr3, opcl3, opf3
d.P(oc2H5)3 can be obtained by the interaction of PBR3 with sufficient amounts of C2H5OH
2.The following statement is correct ( ).
a.Iron reacts with iodine to form ferric iodide.
b.Electrolysis of ZnSO4 solution can yield Zn
c.Magnesium carbonate is produced by precipitating Mg2+ in magnesium-rich seawater with lime.
d.SO2 is introduced into the BACL2 solution to generate a BASO3 precipitate.
3.Modern industry often uses sodium chloride, carbon dioxide and ammonia as raw materials to prepare soda ash, and part of the process flow is shown in the figure
The statement is wrong ( ).
a.The reaction principle is CO2 + NH3 + NaCl + H2O NaHCO3 + NH4Cl
b.A sufficient amount of CO2 and then a sufficient amount of NH3 are introduced into the saturated NaCl solution
c.The precipitate generated by the reaction can be filtered, washed, and calcined to obtain soda ash.
d.Ammonia gas is introduced into the mother liquor, fine salt particles are added and cooled down to precipitate ammonium chloride.
4.Among the groups of substances listed in the table below, the one that cannot achieve the transformation of "A-B-C" through a one-step reaction between substances is ( ).
a. a b. b c. c d. d
5.Sufficient amounts of the following gases are introduced into the dilute Na2S solution, and the solution can be turbid ( ).
a. co b. so2 c. hcl d. co2
6.In the following groups of substances, the transformation between substances can be achieved through a one-step reaction as shown in the figure ( ).
a. a b. b c. c d. d
7.The solution after the reaction is heated and evaporated, and fully burned at 300 until the quality remains unchanged, and the final pure substance can be obtained ( ).
a.Excess Cl2 is introduced into the FeSo4 solution
b.Excess Cl2 is introduced into the KI and Nabr mixture
c.Add excess HCl solution to Naalo2 solution.
d.Add excess HCl solution to the NaHCO3 solution.
8.The following experiments were conducted using the device shown in the figure below, and the corresponding experimental conclusions were drawn ( ).
a. a b. b c. c d. d
9.During the fight against the new coronavirus, the main active ingredient of "84 disinfectant" used is ( ).
a. naoh b. nacl c. naclo d. na2co3
10.The idea of "analogy" is widely used in the field of chemistry, and the following "analogy" is reasonable ( ).
a. a b. b c. c d. d
11.The following statement is correct ( ).
a.Sulfur trioxide is dissolved in water to conduct electricity, and sulfur trioxide is an electrolyte.
b.All the atoms in the CO2 molecule satisfy the outermost 8-electron structure.
c.The properties of silicon are very stable at room temperature, and there is a free state of silicon in nature.
d.NH4NO3 is composed of non-metallic elements and belongs to the covalent compound.
12.The classification and valence relationship of some iron-containing substances are shown in the figure. The following inferences are unreasonable ( ).
a.A can react with E to form B
b.b can be both oxidized and reduced.
c.E can be added to the concentrated lye solution to obtain D colloid.
d.There can be a cyclic transformation relationship of b, c, d, e b.
13.The following are the following applications of metals and their compounds that are unreasonable
a.Scrap iron filings are added to FeCl2 solution, which can be used to remove Cl2 from industrial exhaust gases
b.An appropriate amount of lithium is added to aluminum to make low-density, high-strength aluminum alloy, which can be used in the aviation industry.
c.Saline-alkali land (containing more Na2CO3, etc.) is not conducive to crop growth, and hydrated lime can be applied to improve.
d.Anhydrous CoCl2, blue in color, will turn pink when absorbed, and can be used to judge whether the color-changing silicone absorbs water.
14.The following conclusions from experimental phenomena are correct ( ).
a.SO2 gas is introduced into the H2S gas, and a yellowish solid is produced on the wall of the bottle, which proves that SO2 is oxidizing.
b.When nitrogen dioxide gas is compressed, the color of the gas darkens, which proves that the content of NO2 in the mixture of N2O4 and NO2 increases when pressurized.
c.Dilute sulfuric acid was added dropwise to the Fe(NO3)2 solution, and the solution turned yellow, proving that dilute sulfuric acid could oxidize Fe2+ to Fe3+
d.At room temperature, concentrated sulfuric acid was injected into the iron container, and there was no obvious phenomenon, which proved that iron did not react with concentrated sulfuric acid at room temperature.
15.A small amount of SO2 gas was introduced into the mixed solution of BaCl2 and FeCl3, and the color of the solution changed from brownish yellow to light green, and white precipitate was generated. In view of the above changes, the following analysis is correct ( ).
a.This experiment showed that SO2 has bleaching properties BThe white precipitate is baso3
c.This experiment showed that FeCl3 had a reducing dThe acidity of the solution is enhanced after the reaction.
16.The classification and corresponding valence relationship of some nitrogen-containing substances are shown in the figure, and the relevant inference is unreasonable ( ).
a.A is chemically stable and can be used to preserve food.
b.e can be both oxidized and reduced.
c.The salt solution produced by the reaction of C and F at the same concentration and volume is weakly alkaline.
d.The process of making f in industry: a b d e f
17.The properties of metals and their compounds are complex and changeable, and the following experimental conclusions are inconsistent with the experimental scheme and phenomena ( ).
a. a b. b c. c d. d
18.Chemistry is an experiment-based science. The following experimental design achieves the purpose of ().
a. a b. b c. c d. d
19.(2022 Shanghai Municipal District Final Examination) Mr. Hou Debang is the pioneer and founder of China's modern chemical industry, and the process flow of Hou's alkali production process invented by him in 1943 is shown in the figure. The following statement is incorrect ( ).
a.The substances recycled in this process are CO2 and NH3
b.The main product of the process is soda ash, and the by-product is NH4CL
c.In the "filtered" mother liquor, n(na) is smaller than n(cl).
d.The process involves chemical reactions, metathesis reactions, and decomposition reactions.
20.NaCl is a chemical raw material that can be used to prepare a range of substances (see figure). The following statement is correct ( ).
a.When saturated brine is electrolyzed by cation exchange membrane method, NaOH and H2 are obtained from the cathode
b.BrCl is similar to Cl2, and BrCl can react with Cl2 to obtain Bri2
c.When NaHCO3 is produced industrially, CO2 is introduced into the refined saturated brine first, and then NH3 is introduced
d.When NaHCO3 is prepared industrially, the mother liquor after NaHCO3 precipitation is filtered, and after ammonia absorption, cooling and cold analysis, NaCl salting out is added to obtain NaHCO3 precipitation.
21."Physics Knowledge: Gold and Stone" mentions: "The alum factory is smoky, the clothes are easy to rot, and the trees are not luxuriant, but the black cypress tree is not afraid of its anger." The "strong heat" alum "gets the red solid, and the "alum factory gas" condenses the alum oil. Hydrochloric acid can be prepared from alum oil, and the micro-chemical processes involved are shown in the figure
The following statement is wrong ( ).
a.x is fe2o3 bThe gas W can fade the magenta solution.
c.The boiling point of alum oil is higher than that of HClThe above process only involves redox reactions.
22.The following conclusions from experimental phenomena are correct ( ).
a.SO2 gas is introduced into the H2S gas, and a yellowish solid is produced on the wall of the bottle, which proves that SO2 is oxidizing.
b.When nitrogen dioxide gas is compressed, the color of the gas darkens, which proves that the content of NO2 in the mixture of N2O4 and NO2 increases when pressurized.
c.Dilute sulfuric acid was added dropwise to the Fe(NO3)2 solution, and the solution turned yellow, proving that dilute sulfuric acid could oxidize Fe2+ to Fe3+
d.At room temperature, concentrated sulfuric acid was injected into the iron container, and there was no obvious phenomenon, which proved that iron did not react with concentrated sulfuric acid at room temperature.
23.Both sodium peroxide and potassium superoxide (KO2) can react with CO2 and water vapor to form O2, which is commonly used as oxygen supply for plateau and deep-water operations. The following statement is incorrect ( ).
a.Na2O2 and Ko2 are both ionic compounds.
b.KO2 is used as both an oxidant and a reducing agent when the oxygen supply reaction occurs.
c.Na2O2 is left in the air for a long time, and the final solid obtained is Na2CO3
d.The amount of KO2 and Na2O2 of the same substance completely undergoes oxygen supply reaction, and the oxygen supply of Na2O2 is large.
24.The dilute solutions of the following groups of substances react with each other, whether the former is dropped into the latter, or the latter is dropped into the former, the reaction phenomenon is the same ( ).
a.NaHSO4 and BA(OH)2BALCL3 and NaOH
c.Naalo2 and H2SO4 DNa2CO3 and H2SO4
25.An experimental team used the experiment shown in the figure below to show the reaction of **Na2O2 with water:
The correct of the following statements is ( ).
a.The main component of a large number of bubbles in is hydrogen.
b.The solution turns red, indicating the formation of an acidic substance.
c.The phenomenon may be caused by the presence of strong oxidizing substances in the solution.
d.The main effect of mnO2 is to reduce the solubility of oxygen in water.