Chemistry Past Paper PDF

An element whose atoms have the electronic formula 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p3 is called: Choose one answer: a. niobium (Cb) b. tin (Sn) c. bismuth (Bi) d. antimony (Sb) Elements in which the highest oxidation state is not numerically equal to the group number of these elements ar...

An element whose atoms have the electronic formula 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p3 is called: Choose one answer: a. niobium (Cb) b. tin (Sn) c. bismuth (Bi) d. antimony (Sb) Elements in which the highest oxidation state is not numerically equal to the group number of these elements are: Choose one or more answers: a. F b. C c. O d. B e. N The metallic properties of atoms decrease in the following order: Choose one answer: a. Pt > Pd > Ni b. Ni > Pd > Pt c. Pd > Ni > Pt A stronger acid is: Choose one answer: a. HPO3 b. H3AsO4 c. H3SbO4 In the presented series of compounds: hypochlorous acid, perchloric acid, hypophosphorous acid, phosphorous acid, bromic acid, hydrochloric acid, the number of molecules having a central atom oxidation state of +1 is equal to: Choose one answer: a. 0 b. 1 c. 2 d. 3 Among the substances HNO3, NH4NO3, K2HPO4, H3PO4, H2O2, the number of compounds with an ionic bond is: Choose one answer: a. 1 b. 2 c. 3 d. 4 Each of the two substances has the same type of crystal lattice in the solid state: Choose one answer: a. Silica and sodium hydroxide b. Chlorine and hydrogen c. Sodium chloride and sulfuric acid d. Water and aluminum Expression of the law of mass action for the reaction H2O (liq) ↔ H+ + OH- looks like: Choose one answer: a. [H+] [OH−] H2 O b. [𝐻 + ] [OH− ] [𝐻 + ] [OH− ] c. H2 O The state of chemical equilibrium is characterized by: Choose one answer: a. the excess of the speed of the forward reaction over the speed of the reverse reaction b. the equality of the rates of the forward and reverse reactions c. constant speed of forward and reverse reaction d. the equality of the concentrations of the reactants of the direct and reverse reactions 100 ml of solution contains 1 g of H2SO4 and H3РO4. Molar concentrations of acids in solution are: Choose one answer: a. different b. the same The amount of hydrogen ions in a solution containing 6 g of acetic acid, if the degree of dissociation of the acid is 3%, is equal to: Choose one answer: a. 0.018 mol b. 0.003 mol c. 1.8 mol d. 0.03 mol Solution with the highest electrical conductivity is obtained by dissolving the following compound: Choose one answer: a. Na2O b. H3PO4 c. MgO d. HClO Of the transformations presented, the reaction of the formation of a simple substance as a result of redox dismutation is: Choose one answer: a. 2KMnO4 + 16HCl = 2MnCl2 + 5Cl2+ 8H2O b. H2O2 + 2KI = I2 +2 KOH c. 2NaH + 2H2O = 2NaOH + H2 d. 2Li + 2H2O = 2LiOH + H2 When using iron sheets with copper rivets, which of the following will corrode in the first place: Choose one answer: a. iron b. both metals corrode equally c. copper The coordination number in the complex compound [Cu(NH3)2]OH is equal to: Choose one answer: a. 1 b. 2 c. 3 d. 4 A compound that reacts with HCl solution but does not react with NaOH solution is: Choose one answer: a. CO2 b. CrO3 c. CrO d. MgO In the chain of transformations substances A and B can be: Choose one answer: a. A - NaOH, B - Na2SO4 b. A - KOH, B – (NH4)2SO4 c. A – NH3, B - H2SO4 d. A - NaOH, B - H2SO4 Are the following statements about the properties of calcium correct? A) Calcium burns in oxygen to form oxide. B) Calcium interacts with an aqueous solution of sodium chloride. Choose one answer: a. Only A is correct. b. Only B is correct. c. Both statements are correct. d. Both statements are wrong. Formula of a compound predominantly formed during the combustion of sodium is: Choose one answer: a. EO b. EO2 c. E2O2 d. E2O MgSO4 solution contains ions of: Choose one answer: a. Mg2+, H+ b. Mg2+, MgOH+, H+ c. MgOH+, H+ d. Mg2+, SO42- Establish a correspondence between the starting substances and the reaction products between them: Al(OH)3 + NaOH → NaAlO2 + CO2 Al(OH)3 + NaOH(soln) → NaAlO2 + H2O Al(OH)3 + Na2CO3 → Al2O3 + H2O Al(OH)3 → Na[Al(OH)4] For d-metals the following is characteristic: Choose one answer: a. Filling the outer d-sublevel with electrons. b. Participation in the formation of cations of only d-electrons of the pre-external level. c. Filling with electrons of the pre-outer (n-1) level. d. Participation in the formation of cations of only s-electrons of the external level. The lowest oxidation state of nitrogen in its compounds is: Choose one answer: a. -3 b. 0 c. -5 d. +1 Metal oxide and hydrogen are formed when which of the following is heated with water: Choose one answer: a. Copper b. Sodium c. Potassium d. Manganese Iodine, unlike chlorine, does not interact with: Choose one answer: a. iron b. sodium fluoride c. sodium bromide d. aluminum A compound that releases oxygen upon thermal decomposition is: Choose one answer: a. CuCO3 b. NH4NO3 c. NaNO3 d. Na2SO4 The characteristic of sulfuric acid, reflecting its properties, is the following: Choose one answer: a. It belongs to weak acids. b. It reacts with iron without heating. c. It has dehydrating properties. d. It belongs to volatile acids. Nitrogen has the minimum oxidation state in the following compound: Choose one answer: a. N2H4 b. N2O c. NH3 d. HNO2 In the chain of transformations the final product X3 can be: a. Na2HPO3 b. NaH2PO4 c. NaOH d. Na2HPO4 When boiling a baking soda solution: Choose one answer: a. Sodium hydroxide is formed. b. There is an increase in the mass fraction of edible salt in the solution. c. Sodium carbonate is formed and carbon dioxide is released. d. No change happens. Silicon (IV) oxide reacts with: Choose one answer: a. H2SO4 b. HCl c. HF d. H2O Which substance corresponds to a given structural formula? Answer: Phosphatidic acid In a 2,3-dimethylbutanol-2 molecule, the number of tertiary carbon atoms is: Choose one answer: a. 1 b. 2 c. 3 d. 4 Interclass isomers of esters and ketones are, respectively: Choose one or more answers: a. aldehydes b. monohydric alcohols c. dihydric alcohols d. carboxylic acids e. ethers What is the molar mass of propylcyclopentane (g/mol)? Write the number accurate to whole integers. Answer: 112 Which of the following statements are correct? A) Non-polar and low-polarity C-C and C-H bonds usually undergo homolytic bond breaking with the formation of free radicals. B) The polymerization reaction is accompanied by the formation of low molecular weight by- substances. Choose one answer: a. Only A is correct. b. Only B is correct. c. Both statements are correct. d. Both statements are wrong. Sequence of types of hybridization of carbon atoms sp3 - sp2 - sp2 – sp3 corresponds to the following substance: Choose one answer: a. Butene-1 b. Butane c. 2-chlorobutane d. Butene-2 Geometrical configuration of the ethene molecule is: Choose one answer: a. Plane-triangular b. Linear c. Angular d. Tetrahedral The aromaticity in the benzene molecule is retained in the following reaction: Choose one answer: a. Oxidation (combustion) b. Radical chlorination c. Hydrogenation d. Nitration The primary alcohol is: Choose one answer: a. 2-methylpropanol-1 b. 2-methylbutanol-2 c. Isopropanol d. 3-methylpentanol-3 Which of the following statements about the properties of acetaldehyde are correct? Choose one or more answers: a. Under normal conditions it is an odorless gas. b. It forms hydrogen bonds, due to which it is soluble in water. c. Its hydrogenation product is ethanol. d. It undergoes the "silver mirror" reaction. e. It is an isomer of acetone. f. It is oxidized with copper (II) hydroxide to acetic acid. Establish a correspondence between the starting substances and carbon products that are formed as a result of the reaction. CH3COOH + KMnO4 + H2SO4 → bromoacetic acid carbon monoxide no oxidation occurs carbon dioxide CH3COOH + Br2 (Pcrys) → HCOOH + KMnO4 + H2SO4 → What group of substances does dimethylamine belong to? Choose one answer: a. Primary amine b. Secondary amine c. Tertiary amine d. Aromatic amine Are the following statements about the properties of glucose correct? A) In aqueous solution, glucose is hydrolyzed to form simpler monosaccharides. B) Glucose undergoes a "silver mirror" reaction. Choose one answer: a. Only A is correct. b. Only B is correct. c. Both statements are wrong. d. Both statements are correct. In the chain of transformations Substance D is: Choose one answer: a. 1-nitropropane b. nitroethane c. 2-nitrobutane d. 1-nitrobutane Acetone cannot be obtained in: Choose one answer: a. alkaline hydrolysis of 2,2-dibromopropane b. oxidation of propanol-2 c. hydration of propyne d. oxidation of propanol-1 The gas released during combustion of 16 g of sulfur was passed through an aqueous solution of CaCO3 suspension saturated with oxygen. Calculate the mass (in grams) of the resulting salt. Round your answer to whole numbers. Make an equation for the redox reaction, select the coefficients: H2SO3 + Cl2 + H2O = The electronic formula of the Mn2+ ion is: Choose one answer: a. 1s2 2s2 2p6 3s2 3p6 3d54s2 b. 1s2 2s2 2p6 3s2 3p6 3d4 4s1 c. 1s2 2s2 2p6 3s2 3p6 3d34s2 d. 1s2 2s2 2p6 3s2 3p6 3d5 The electronic formula of the Cl3+ ion is: Choose one answer: a. 1s2 2s2 2p6 3s2 3p4 b. 1s2 2s2 2p6 3s2 3p3 c. 1s2 2s2 2p6 3s2 3p0 d. 1s2 2s2 2p6 3s2 3p2 With an increase in the electronegativity of an atom of an acid-forming element, the acidic properties of its oxide and hydroxide: Choose one answer: a. increase b. decrease c. do not change The nucleus of the 8036Kr isotope contains: Choose one answer: a. 36 neutrons and 44 protons b. 36 protons and 80 neutrons c. 44 neutrons and 36 protons The valence of an atom in a molecule is: Choose one answer: a. the number of single electrons at the outer level of an atom b. the number of covalent bonds formed by an atom in a molecule c. the number of electrons at the outer level of an atom d. the ability of an atom to form a certain number of covalent bonds A molecule of a substance in which the central atom is in the sp2-hybrid state is: Choose one answer: a. CH3OH b. NH3 c. PH3 d. AlCl3 Chloride ions are absent in the crystals of: Choose one answer: a. Cesium chloride b. Phosphorus (V) chloride c. Potassium chloride d. Calcium chloride When AgF is added to a solution of calcium chloride, ions that will interact in the solution are: Choose one answer: a. Ag+ with Сl- b. Ag+ with Сl- and Сa2+ with F- c. Сa2+ with F- The endothermic reaction is one of the following: Choose one answer: a. H2S → H2 + S - 21 kJ b. N2 + 3H2 → 2NH3+ Q c. 2KNO3 → 2KNO2 + O2 + Q d. CO + H2O → CO2 + H2 + Q 100 g of solution contains 1 g of NaCl, CaCl2, AlCl3. Mass fractions of each of the salts are: Choose one answer: a. different b. the same Degree of dissociation of NH3 in aqueous solution with the addition of a small amount of HCl: Choose one answer: a. will increase b. will not change c. will decrease The compound, in an aqueous solution of which there will be the most acidic environment (provided that the concentration of solutions and temperature are the same) among NH4Cl, AlCl3, CuCl2, is: Choose one answer: a. NH4Cl b. CuCl2 c. in all solutions the pH values are close d. AlCl3 Of the substances presented, the products of the reaction NaНSO3 + НNO3 → are: Choose one or more answers: a. sodium nitrate b. sulfurous acid c. sodium sulfate d. water e. nitrogen (IV) oxide f. sulfur (IV) oxide Of the substances presented, the products of the reaction CuSO4 + KI → are: Choose one or more answers: a. copper (II) iodide b. copper (I) iodide c. copper (I) oxide d. potassium sulfate e. iodine f. sulfur (IV) oxide When a solution of Na[Al(OH)4] is boiled with NH4Cl, the following compound is formed: Choose one answer: a. Al(OH)3 b. NaOH c. AlСl3 d. Na3[Al(OH)6] The compounds that are capable of reacting with each other are: Choose one answer: a. CaO and SiO2 b. FeO and MgO c. CuO and N2O d. N2O5 and CrO3 Establish a correspondence between the metal and the reagents, with each of which the metal can interact: Sodium Does not react with HCl (soln) Iron Reacts with both HCl (soln) and H2O under standard conditions Zinc Does not react with HNO3 (conc.) in the cold Copper Reacts with both HCl (soln) and NaOH (soln) Which row contains only metals? Choose one answer: a. Mg, Ti, Se, Hf b. Zr, Mg, Ce, Ir c. Ac, Al, Br, Co d. Rb, Nb, Kr, La Alkali metal salts in aqueous solution: Choose one answer: a. Hydrolyze by cation. b. Irreversibly dissociate into ions. c. Exist in molecular form. d. Form complex ions. Each of the two following oxides is amphoteric: Choose one answer: a. MgO and BeO b. BeO and Al2O3 c. CaO and Al2O3 d. K2O and BeO The products of the interaction of aluminum with an alkali solution are: Choose one answer: a. Al(OH)3 + Na b. Na[Al(OH)4] + H2 c. Al2O3 + Na2O d. NaAlO 2 + H2 Chromium was dissolved in hydrochloric acid, and a blue solution was formed, the color of which quickly changed to green. After adding soda ash, a gray-green precipitate formed, which was filtered off and treated in a strongly alkaline medium with bromine water, and a yellow solution was obtained. The products of these four described reactions are presented in the following series: Choose one answer: a. СrCl2, СrCl3, Сr(OH)3, Na3CrO3 b. СrCl3, СrOHCl2, Сr(OH)3, Na2CrO4 c. СrCl2, СrCl3, Сr(OH)3, NaCrO2 d. СrCl2, СrCl3, Сr(OH)3, Na2CrO4 Indicate the stage of obtaining the acid. Choose one answer: a. 1 b. 2 c. 3 d. 4 Which of the following does not react with water even when heated: Choose one answer: a. Magnesium b. Zinc c. Aluminum d. Iron Establish a correspondence between the initial substances and the products of interaction between them. Cl2+ KOH(hot)→ ClF3 Cl2+ KOH(cold)→ FCl3 Cl2+ Fe→ KCl + KClO3 Cl2+ F2→ KCl + KClO A compound in which the oxidation state of the oxygen atom is -1 is: Choose one answer: a. BaO2 b. F2O c. H2O d. Na2O Establish a correspondence between the formulas of the starting substances and the reaction products: SO2+ NaOH (excs) → NaHSO4 SO3 + H2O → H2SO3 SO3+ NaOH (excs) → Na2SO3 + H2O SO2 (excs)+ NaOH → H2SO4 Na2SO4 + H2O NaHSO3 Nitrogen reacts with: Choose one answer: a. hydrogen b. water c. HCl solution d. NaOH solution Simple superphosphate in industry is obtained according to the scheme: Choose one answer: a. CaCO3 + H3PO4 → b. Ca3(PO4)2 + H3PO4 → c. Ca(OH)2 + H3PO4 → d. Ca3(PO4)2 + H2SO4 → Sodium carbonate in aqueous solution does not react with: Choose one answer: a. Copper (II) chloride b. Carbon dioxide c. Sodium hydroxide d. Calcium chloride In the chain of transformations the final product X3 is: Choose one answer: a. Na4Si b. SiO2 c. SiH4 d. Na2SiO3 Which of the following statements are correct? A) Carbon is part of all organic compounds. B) Carbon atoms are capable of forming single, double, triple bonds with each other and with other atoms. Choose one answer: a. Only A is correct. b. Only B is correct. c. Both statements are correct. d. Both statements are wrong. In a 2,3,3-trimethylpentane molecule, the number of secondary carbon atoms is: Choose one answer: a. 1 b. 2 c. 3 d. 4 p, π-Conjugation appears in the following compound: Choose one answer: a. СН3–СН2–ОН b. СН2=СН–ОН c. СН3-СН2–ОС2Н5 d. СН2=СН–СН2–ОН When a mixture of chloromethane and chloroethane is exposed to excess of sodium what is not formed: Choose one answer: a. Ethane b. Propane c. Butane d. Pentane Cycloalkanes correspond to the following general formula: Choose one answer: a. CnH2n b. CnH2n-6 c. CnH2n-2 d. CnH2n+2 The hydration product of butene-1 is: Choose one answer: a. Butanol-2 b. Butanoic acid c. Butanol-1 d. Butanal The reaction product of propene with bromine water is: Choose one answer: a. 1,2-dibromopropane b. 2,2-dibromopropane c. 1,1-dibromopropane d. 1,2-dibromopropene Discoloration of bromine water occurs when the following is added to its solution: Choose one answer: a. Benzene b. Styrene c. Toluene d. o-Xylene The ability of lower alcohols to form intermolecular hydrogen bonds is the reason for their: Choose one answer: a. Volatility b. Good water solubility c. Chemical activity d. Non-electrical conductivity Choose statements that are true for ethanal. Choose one or more answers: a. The molecule contains one π-bond b. It is not toxic c. It belongs to the homologous series with the general formula CnH2nO2 d. The molecule contains a carbonyl group. e. It can be obtained by reducing ethanol. In the chain of transformations  CH2Br – CH2Br → X1 →X2 →CH3COOH substances X1 and X2 can be: Choose one answer: a. acetylene and ethanol b. acetylene and 1,2-dichloroethane c. acetylene and 1,1-dichloroethane d. acetylene and ethanal From the following series, select the formulas of substances that can be formed during protein hydrolysis. Choose one or more answers: a. NH2 – CH2COOH b. NH2 – CH2CH2COOH c. NH2 – CH2CH2CH2COOH d. C6H5CH2 – CH(NH2) – COOH e. CH3 –CH(NH2) –CH2COOH Are the following statements about fats correct? A) Fats are esters hydrolysis products. B) Soaps are formed during alkaline hydrolysis of fats. Choose one answer: a. Only A is correct. b. Only B is correct. c. Both statements are correct. d. Both statements are wrong. Intermediate X in the following chain of transformations 1,3-dibromopropane → X → 1-chloropropane is: Choose one answer: a. Propene b. Cyclopropane c. Propyne d. Propane 2,5-dimethylhexane can be obtained by the action of sodium on: Choose one answer: a. sec-butyl chloride b. n-butyl chloride c. iso-butyl chloride d. tert-butyl chloride A mixture of magnesium and beryllium oxides weighing 1 g was treated with an excess of sulfuric acid solution and then with an excess of sodium hydroxide solution. After the completion of the reactions, 1 g of precipitate was formed. Determine the composition (in %) of metals in the initial mixture. Round your answer to whole numbers. Answer: MgO 69 BeO 31 Make an equation for the redox reaction, select the coefficients: NaBr + NaBrO3 + H2SO4 = Determine the sum of all coefficients in the reaction equation. A hydrogen bond is formed between molecules of: Choose one or more answers: a. ethanal b. ethanoic acid c. ethanol d. acetone e. ethane There is a partial negative charge on phosphorus atoms in molecules, the formulas of which are: Choose one or more answers: a. P2O5 b. P2O3 c. PCl3 d. Сa3P2 e. PH3 A stronger base is: Choose one answer: a. Ca(OH)2 b. Ba(OH)2 c. Sr(OH)2 Which of the following contains more protons than electrons: Choose one answer: a. S2- b. Na c. Na+ When the BF3 molecule interacts with HF, hydrogen tetrafluoroborate is formed. The atomic orbital that the boron atom has provided to form the fourth chemical bond with the fluorine atom is: Choose one answer: a. 2p-orbital b. 1s-orbital c. 2s-orbital d. 3d-orbital The saturation of a covalent bond is: Choose one answer: a. the ability of an atom to form an unlimited number of covalent bonds b. the ability of an atom to make the most of its external electrons to form covalent bonds c. the ability of an atom to attract the electron shells of another atom in any direction d. the ability of an atom to form a certain number of covalent bonds Which of the following has a metal crystal lattice: Choose one answer: a. NH3 b. AlCl3 c. Cu3Al d. CuO In a chemical system, the scheme of which is А +2В ↔ С + 3D the initial concentration of substance A is 3 mol/L, substance B is 4 mol/L, and the equilibrium concentration of substance C is 1.5 mol/L. Then the equilibrium constant in the system is equal to: Choose one answer: a. 50.255 b. 91.125 c. 67.255 d. 45.125 With increasing temperature in the reaction system N2(gas) + 3H2(gas) ↔ 2NH3(gas) + Q the ammonia content: Choose one answer: a. will decrease. b. will not change. c. will increase. After adding 8g NaCl in 100g 10% NaCl solution: Choose one answer: a. mass fraction of NaCl became 18%. b. mass fraction of NaCl became 16.67%. c. mass of the solution became 118g. d. mass of the solution has not changed. Degree of dissociation of NH3 in aqueous solution with the addition of a small amount of NaOH: Choose one answer: a. will increase. b. will decrease. c. will not change. Litmus color in Cu(NO3)2 solution is: Choose one answer: a. blue b. purple c. red Of the substances presented, the product of Cl2 oxidation in redox reactions is: Choose one answer: a. KClO b. HCl c. СаCl2 d. KClO3 Redox reaction is: Choose one answer: a. NH3 + HNO3 = NH4NO3 b. C + 2H2 = CH4 c. CaCO3 = CaO + CO2 d. СH3COOCH3 + NaOH = CH3COONa + CH3OH When a K4[Fe(CN)6] solution is added to a FeCl3 solution, a blue "Prussian blue" precipitate is formed with the following composition: Choose one answer: a. KFe[Fe(CN)6] b. Fe2[Fe(CN)6]3 c. K2Fe3[Fe(CN)6]2 d. K2Fe[Fe(CN)6] The salt formed in the reaction P2O5 + 2NaOH +H2O = … is: Choose one answer: a. Na3PO4 b. NaPO3 c. Na2HPO4 d. NaH2PO4 Both oxides have good solubility in water, the formulas of which are: Choose one answer: a. CaO and BeO b. P2O5 and Cr2O3 c. NO2 and CrO3 d. CO2 and SiO2 Are the following statements about the properties of zinc carbonate correct? A) Zinc carbonate has an ionic crystal lattice. B) Thermal decomposition produces zinc oxide and carbon monoxide (II). Choose one answer: a. Only A is correct. b. Only B is correct. c. Both statements are correct. d. Both statements are wrong. Are the statements about the properties of potassium hydroxide correct? A) Potassium hydroxide is amphoteric. B) Potassium hydroxide does not decompose when heated. Choose one answer: a. Only A is correct. b. Only B is correct. c. Both statements are correct. d. Both statements are wrong. Magnesium reacts with each of the substances in the series: Choose one answer: a. HCl, Н2 (cold), O2 (t°), H2S b. N2(t°), HNO3 (dil), Н2О(t°), Сl2 (t°) c. S, HNO3 (conc), NaOH, Сl2 (t°) d. N2(t°), H2SO4 (dil), Н2О (cold), O2 (t°) The product of the interaction of aluminum oxide with an excess of an aqueous solution of hydrochloric acid is: Choose one answer: a. AlCl3 b. H3AlO3 c. Al d. HAlO2 Among the presented compounds, a compound with reducing properties is: Choose one answer: a. Cr2(SO4)3 b. Zn c. MnO2 d. FeCl2 The organic substance urea was synthesized from two inorganic substances belonging to different classes. Indicate the formulas of substances A and B. Choose one answer: a. CaO and NO b. CO2 and NH3 c. CaO and NH3 d. CO2 and NO Which of the following reacts with water under normal conditions: Choose one answer: a. Iron (III) oxide b. Barium oxide c. Nitric (II) oxide d. Iron (II) oxide The products of oxidation of bromide ions with concentrated sulfuric acid are: Choose one answer: a. HBrO3 and SO2 b. HBr and SO2 c. HBr and HSO4- d. Br2 and SO2 A non-oxide is the compound of oxygen with: Choose one answer: a. fluorine b. hydrogen c. chlorine d. sulfur Among the series of compounds H2O, H2S, H2Se, H2Te their acidic properties: Choose one answer: a. decrease b. increase c. decrease and then increase d. do not change Are the following statements about the properties of nitric acid correct? A) Zinc reacts with nitric acid to release hydrogen. B) Iron (III) oxide does not react with nitric acid. Choose one answer: a. Only A is correct. b. Only B is correct. c. Both statements are correct. d. Both statements are wrong. In the chain of transformations  substances X and Y can be: Choose one answer: a. Chlorine and sodium hydroxide b. Chlorine and water c. Hydrogen chloride and water d. Chlorine and sodium bicarbonate Sodium bicarbonate in aqueous solution does not react with: Choose one answer: a. Sodium hydroxide b. Calcium chloride c. Copper (II) chloride d. Carbon dioxide Silicon does not interact with: Choose one answer: a. hydrogen b. fluorine c. nitrogen d. sulfur Which substance corresponds to a given structural formula? Write your answer in a line. Answer: Sucrose Two secondary carbon atoms exist in the molecule of: Choose one answer: a. 2-methylpropane b. ethane c. 2-methylpentane d. 2,2-dimethylbutane Which of the following are not types of structural isomerism: Choose one or more answers: a. optical isomerism b. cis-, trans-isomerism c. carbon skeleton isomerism d. interclass isomerism e. isomerism of the position of the substituent The main product of the reaction of propane with a solution of nitric acid when heated is: Choose one answer: a. Equal amounts of 2-nitropropane and 1-nitropropane b. Propene c. 2-nitropropane d. 1-nitropropane Isomers are: Choose one answer: a. Butane and cyclobutane b. Methylpropane and 2-methylbutane c. Butane and propane d. Butane and 2-methylpropane What is the mechanism of interaction of ethene with bromine water: Choose one answer: a. Addition, radical b. Addition, ionic c. Substitution, radical d. Substitution, ionic In the 2-methylbutene-1 molecule, the carbon atoms are in a state of hybridization: Choose one answer: a. Only sp3 b. sp2 and sp c. Only sp2 d. sp2 and sp3 The interaction of benzene with chlorine under light belongs to the reaction of: Choose one answer: a. Decomposition b. Substitution c. Addition d. Elimination 3-methylbutanol-2 corresponds to the structural formula: Choose one answer: a. b. c. d. Which of the following statements are true for both propanal and propanone? Choose one or more answers: a. belong to the class of carbonyl compounds. b. have the molecular formula C3H6O. c. under normal conditions are odorless liquids. d. can be obtained by the Kucherov reaction. e. undergo a "silver mirror" reaction. f. oxidize with copper hydroxide to propanoic acid. Based on the data in the table, rank the oils in order of increasing amount of hydrogen required to hydrogenate 1 mole of each oil. Oil Acids in oils Linolenic - Linoleic - Oleic - Stearic - С17Н29СООН С17Н31СООН С17Н33СООН С15Н31СООН, palmitic - С17Н35СООН Rapeseed 11% 21% 61% 7% Olive 10% 75% 15% Linseed 60% 17% 15% 8% Sunflower 66% 22% 12% Choose one answer: a. olive - linseed - rapeseed - sunflower b. sunflower - olive - rapeseed - linseed c. olive - sunflower - rapeseed - linseed d. olive - sunflower - linseed – rapeseed From the proposed list, select the formulas of substances that are homologues of aminoacetic acid. Choose one or more answers: a. b. c. СН3СООН d. e. In the chain of transformations substance X is: Choose one answer: a. С3Н7COOH b. СН3CH(OH)COOH c. СН3COOH d. С2Н5OH In the chain of transformations compound D is: Choose one answer: a. Methyl butanoate b. Butanol-1 c. 1-methoxybutanol-1 d. Methyl butyl ether In the synthesis proceeding according to the following chain: С6H12O6 →X→CH3COH→Y→CH3COONa substances X and Y can be: Choose one answer: a. X - CO2 , Y- C2H5OH b. X – C2H5OH , Y- CH3СOOH c. X – C2H5OH , Y- CH3CHCl3 d. X – C2H6 , Y- C2H5Сl A volume of hydrogen sulfide of 2.24 l (NC) was passed through the FeCl3 solution and exactly the same volume through the AgNO3 solution. Calculate the masses (g) of the precipitation formed. Round your answer to the nearest tenth. Answer: 3.2 and 24.8 Make an equation for the redox reaction, select the coefficients: I2 + Na2SO3 + H2O = Determine the sum of the coefficients in the reaction equation.