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waec/wassce past questions and answers for CHEMISTRY-2022 including pdf practical

May 23 2024 09:15:00 PM

John Elijah

WAEC/GCE/NECO

WASSCE objective, essay, and practical past questions and answer (CHEMISTRY 2022)

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Great mind! welcome to poscholars website. Probably you used any of the search engine and you find us. You are welcome too. In this post, we are going to provide you with the Wassce resource of the 2022 examination. These includes the objectives questions and answers, the paper 2 questions and answer, and lastly the paper 3 questions and answers.
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You can study the 50 (fifty) objectives, theory and practical WASSCE physics past questions and answer for 2023 by checking the content below or using the table of content below to navigate to the number of your choice
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Table of Contents
  1. WASSCE/WAEC Chemistry (2022) Questions and Answers 1 - 10
  2. WASSCE/WAEC Chemistry (2022) Questions and Answers 11 - 20
  3. WASSCE/WAEC Chemistry (2022) Questions and Answers 21 - 30
  4. WASSCE/WAEC Chemistry (2022) Questions and Answers 31 - 40
  5. WASSCE/WAEC Chemistry (2022) Questions and Answers 41 - 50
  6. Download WASSCE/WAEC Chemistry pdF (2023) Paper 2 (essay questions and answer 1 - 5)
  7. Download WASSCE/WAEC Chemistry pdf (2023) Paper 3 (Practical questions and answer 1 - 3)
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WASSCE/WAEC Chemistry (2022) Questions and Answers 1 - 10

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1. The by-product of fermentation of sugar is
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(a) Carbon (IV) oxide
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(b) Ethanoic acid
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(c) Propanol
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(d) Propan-1,2, 3-triol
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The correct answer is: (a) Carbon (IV) oxide
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2. Which of the following sugars is a product of the condensation of monosaccharides?
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(a) Galactose
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(b) Maltose
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(c) Glucose
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(d) Fructose
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The correct answer is: (b) Maltose
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3. The cleansing effect of soap is low in acidic water because of
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(a) The formation of unionized fatty acid
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(b) Increase in the PH of the soap molecules
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(c) Anti-biodegradable effect of hydrogen ions
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(d) The hardness of the acidic water
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The correct answer is: (a) The formation of unionized fatty acid
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4. The following compounds are condensation polymers except
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(a) Nylon
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(b) Protein
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(c) Starch
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(d) Polyethene
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The correct answer is: (d) Polyethene
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5. What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3{AlCl}_3?
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(a) One faraday
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(b) One ampere
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(c) Three faradays
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(d) Three amperes
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The correct answer is: (c) Three faradays
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6. Which of the following compounds would react rapidly with bromine?
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(a) Benzene
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(b) Hexane
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(c) Hexene
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(d) Hexanol
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The correct answer is: (c) Hexene
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7. Alkanols can be manufactured from alkenes by the initial reaction of alkenes with
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(a) Bromine in tetrachloromethane
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(b) Concentrated tetraoxosulphate (VI) acid
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(c) Aqueous potassium tetraoxomanganate (VII)
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(d) Sodium hydroxide solution
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The correct answer is: (b) Concentrated tetraoxosulphate (VI) acid
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8. Which of the following statements about the standard hydrogen electrode is not correct?
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(a) The hydrogen gas is at a pressure of 1 atmosphere
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(b) A solution containing 1 mol dm−3ofH(aq)+{dm}^{-3} of {H}^{+}_{(aq)} ions is used
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(c) A platinum electrode is used
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(d) The temperature is kept at 200{20}^{0}
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The correct answer is: (d) The temperature is kept at 200{20}^{0}
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9. If 60g of M combines with 24g of oxygen, what would the empirical formula of the oxide be? [O = 16.0, M = 120]
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(a) MO
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(b) MO2{MO}_2
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(c) MO3{MO}_3
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(d) MO4{MO}_4
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The correct answer is: MO4{MO}_4
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10. The products of the electrolysis of dilute sodium chloride using carbon electrodes are
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(a) Chlorine and sodium
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(b) Oxygen and hydrogen
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(c) Chlorine and hydrogen
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(d) Hydrogen and oxygen
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The correct answer is: (b) Oxygen and hydrogen
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WASSCE/WAEC Chemistry (2022) Questions and Answers 11 - 20

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11. Determine the quantity of electricity used when a current of 0.20 amperes is passed through an electrolytic cell for 60 minutes
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(a) 12
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(b) 120
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(c) 360
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(d) 720
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The correct answer is: (d) 720
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12. Oxochlorate (I) acid is used as a bleaching agent because it is
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(a) A weak acid
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(a) A reducing agent
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(c) An oxidizing agent
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(d) A strong acidz
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The correct answer is: (c) An oxidizing agent
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13. The IUPAC name for CH3CHCH3CHClCHCH3{CH}_3{CHCH}_3{CHClCHCH}_3 is
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(a) 2, 4-dimethyl-3-chlorohexane
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(b) 3, 5-dimethyl-4-chlorohexane
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(c) 4-chloro-3, 5-dimethylhexane
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(d) 3-chloro-2, 4-dimethylhexane
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The correct answer is: (d) 3-chloro-2, 4-dimethylhexane
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14. A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added to a sample of a salt. the gas evolved could turn
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(a) Acidified K2Cr2O7{K}_2{Cr}_2{O}_7 solution colourless
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(b) Acidified KMnO4{KMnO}_4
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(c) Fe(NO3)2Fe{({NO}_3)}_2 solution green
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(d) Pb(NO3)2Pb{({NO}_3)}_2 paper black
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The correct answer is: (d) Pb(NO3)2Pb{({NO}_3)}_2 paper black
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15. If 5.0g of marble reacts with 25.0cm3{25.0cm}^3 hydrochloric acid, which of the following combinations has the fastet reaction rate?
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(a) Marble chips and 2.0 mol dm−3HCl(aq){dm}^{-3} {HCl}_{(aq)}
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(b) Marble chips and 2.5 mol dm−3HCl(aq){dm}^{-3} {HCl}_{(aq)}
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(c) Powdered mmarble and 2.5 mol dm−3HCl(aq){dm}^{-3} {HCl}_{(aq)}
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(d) Powdered marble and 2.0 mol dm−3HCl(aq){dm}^{-3} {HCl}_{(aq)}
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The correct answer is: (c) Powdered mmarble and 2.5 mol dm−3HCl(aq){dm}^{-3} {HCl}_{(aq)}
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16. Increasing the temperature generally
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(a) Decreases the solubility of a solid in a liquid but increases the solubility of a gas in a liquid
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(b) Increases the solubility of a solid in a liquid but decreases the solubility of a gas in a liquid
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(c) Increases the solubility of both a solid and a gas in a liquid
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(d) Decreases the solubility of both a solid and a gas in a liquid
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The correct answer is: (b) Increases the solubility of a solid in a liquid but decreases the solubility of a gas in a liquid
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17. A white precipitate was formed when BaCl2(aq){BaCl}_{2(aq)} was added to an aqueous solution of a salt X. The precipate dissolved in dilute HCL with rapid effervescence. Salt X is likely to contain.
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(a) SO42−{SO}^{2-}_{4} ions
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(b) SO32−{SO}^{2-}_{3} ions
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(c) NO3−{NO}^{-}_{3} ions
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(d) CO32−{CO}^{2-}_{3} ions
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The correct answer is: (d) CO32−{CO}^{2-}_{3} ions
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18. Before a reaction could take place, there should be
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(a) Ionization of reactant particles
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(b) Breakage of bonds of products
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(c) Breakage of bonds of reactants
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(d) Ionization of product particles
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The correct answer is: (c) Breakage of bonds of reactants
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19. Consider the following reaction equation:
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CaO+SiO2→CaSiO3CaO + {SiO}_2 \rightarrow {CaSiO}_3
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Silicon (IV) oxide is acting as
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(a) A basic oxide
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(b) A reducing agent
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(c) An acidic oxide
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(d) An oxidizing agent
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The correct answer is: (c) An acidic oxide
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20. Which of the following acids would form normal salt only?
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(a) Tetraoxosulphate (VI) acid
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(b) Trioxonitrate (V) acid
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(c) Tetraoxosulphate (V) acid
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(d) Trioxosulphate (IV) acid
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The correct answer is: (b) Trioxonitrate (V) acid
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WASSCE/WAEC Chemistry (2022) Questions and Answers 21 - 30

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21. What is the partial pressure of oxygen at s.t.p in a gaseous mixture containging 100cm3{100 cm}^3 of oxygen and 900cm3{900cm}^3
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(a) 1.0 atm
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(b) 1.0 atm
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(c) 9.0 atm
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(d) 0.9 atm
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The correct answer is: (b) 1.0 atm
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22. Graphite is used as a dry lubricant due to the presence of
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(a) Mobile electrons
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(b) Free electrons
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(c) Octahedral structures
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(d) Layered structures
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The correct answer is: (d) Layered structures
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23. Which of the following gases is alkaline?
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(a) No2{No}_2
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(b) Co2{Co}_2
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(c) NH3{NH}_3
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(d) N2O{N}_2{O}
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The correct answer is: (c) NH3{NH}_3
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24. Which of the following statements about an equilibrium system is correct?
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(a) Forward and backward reactions occur at the same time
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(b) The concentrations of reactants must equal that of the products.
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(c) The concentrations of reactants and products can be changed by adding a catalyst
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(d) The concentrations of reactants and products are not affected by a change in temperature
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The correct answer is: (a) Forward and backward reactions occur at the same time
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25. Consider the following reaction equation:
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N2(g)+3H2(g)⇌2NH3(g);δH=−92kJ.{N}_{2(g)} + {3H}_{2(g)} \rightleftharpoons {2NH}_{3(g);} \delta{H} = -92kJ.
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Increasing the temperature of the reaction would:
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(a) Shift the equilibrium to the right
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(b) Increase the yield of ammonia
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(c) Decrease the amount of hydrogen
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(d) Decrease the yield of ammonia
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The correct answer is: (d) Decrease the yield of ammonia
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26. When air in a syringe is compressed such that there is no change in temperature, the
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(a) Air liquefies
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(b) Pressure increases
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(c) Intermolecular space increases
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(d) Density decreases
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The correct answer is: (b) Pressure increases
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27. Which of the following statements about liquids is/are true? I Liquids maintain their volume at constant temperature II. Liquids have fixed shape III. Liquids do not diffuse IV. Change in pressure affects volume of liquids.
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(a) I only
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(b) IV only
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(c) I and IV only
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(d) II and III only
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The correct answer is: (a) I only
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28. A hydrogen chloride gas eacted with oxygen gas to yield water and chlorine gas. The mole ratio of the hydrogen chloride gas to water is
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(a) 1:3
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(b) 2:1
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(c) 3:1
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(d) 4:1
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The correct answer is: (b) 2:1
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29. What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2dm3{8.2 dm}^{3}cylinder? [R = 0.082 atm dm3mol−1K−1{dm}^{3} {mol}^{-1}{K}^{-1}]
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(a) 0.32
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(b) 1.52
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(c) 3.13
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(d) 31.25
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The correct answer is: (c) 3.13
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30. If 50cm3{50cm}^{3} of saturated solution of KNO3{KNO}_3 at 40oC{40}^{o}C
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(a) 1.0 mol dm−3{dm}^{-3}
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(b) 1.5 mol dm−3{dm}^{-3}
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(c) 2.0 mol dm−3{dm}^{-3}
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(d) 5.0 mol dm−3{dm}^{-3}
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The correct answer is: (a) 1.0 mol dm−3{dm}^{-3}
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WASSCE/WAEC Chemistry (2022) Questions and Answers 31 - 40

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31. Which of the following elements would displace copper from a solutionn of copper ions?
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(a) Silver
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(b) Gold
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(c) Lead
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(d) Mercury
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The correct answer is: (c) Lead
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32. What is the percentage composition of carbon in Ca(HCO3)2Ca{({HCO}_{3})}_{2}? [Ca = 40.0, O = 16.0, C = 12.0, H = 1.0]
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(a) 22.2%
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(b) 14.8%
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(c) 1.4%
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(d) 3.7%
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The correct answer is: (b) 14.8%
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33. Which of the following bond types is intermolecular?
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(a) Covalent bond
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(b) Hydrogen bond
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(c) Ionic bond
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(d) metallic bond
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The correct answer is: (b) Hydrogen bond
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34. The maximum number of covalent bonds formed by nitrogen is
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(a) 1
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(b) 2
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(c) 3
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(d) 4
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The correct answer is: (c) 3
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35. The IUPAC name of the compound CH3CH(CH)3CHCH2{CH}_{3}{CH{(CH)}_{3}}{CHCH}_2
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(a) 2-methyl but-1 ent
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(b) 2-methyl but-2 ene
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(c) 3-methyl but-1-ene
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(d) 3-methyl but-2-ene
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The correct answer is: (c) 3-methyl but-1-ene
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36. Ionization energy increases across the period in the periodic table because
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(a) Atomic number increases
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(b) Effective nuclear charge increases
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(c) Mass number decreases
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(d) Screening effect decreases
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The correct answer is: (b) Effective nuclear charge increases
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37. Which of the following properties indicate that an element is a metal. it (I) reacts with oxygen to form an acidic oxide (II) forms ionic chlorides (III) has variable oxidation states (IV) Displaces hydrogen from dilute HCL?
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(a) I and III only
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(b) I and II only
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(c) II and IV only
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(d) I, II, III and IV
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The correct answer is: (c) II and IV only
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38. The electron configuration of carbon atom in its excited state is
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(a) 1s22s22px22py0{1s}^{2}{2s}^{2}{2p}^{2}_{x}{2p}^{0}_{y}
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(b) 1s22s22px12py1{1s}^{2}{2s}^{2}{2p}^{1}_{x}{2p}^{1}_{y}
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(c) 1s22s12px12py12py12pz1{1s}^{2}{2s}^{1}{2p}^{1}_{x}{2p}^{1}_{y}{2p}^{1}_{y}{2p}^{1}_{z}
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(d) 1s12s22px12py12pz1{1s}^{1}{2s}^{2}{2p}^{1}_{x}{2p}^{1}_{y}{2p}^{1}_{z}
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The correct answer is: (c) 1s22s12px12py12py12pz1{1s}^{2}{2s}^{1}{2p}^{1}_{x}{2p}^{1}_{y}{2p}^{1}_{y}{2p}^{1}_{z}
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39. An oxide has the following properties. (I) is a white powder (II) Reacts with HCL (III) Reacts with NaOH (IV) is insoluble in water. The oxide is
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(a) Alkaline
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(b) Amphoteric
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(c) Acidic
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(d) Newtral
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The correct answer is: (b) Amphoteric
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**40. Which of the following statements about atoms of a metal is correct? They
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(a) Readily accept electrons
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(b) Are soft
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(c) Are held together by covalent bond
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(d) Are held together by a sea of electron cloud
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The correct answer is: (d) Are held together by a sea of electron cloud
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WASSCE/WAEC Chemistry (2022) Questions and Answers 41 - 50

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41. Which of the following sketches is a graphical representation of Boyle's law?
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The correct answer is: (a) It is a strong oxidizing agent
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42. The atom with the electron configuration 1s22s22p63s23p63d104s24p4{1s}^{2}{2s}^{2}{2p}^{6}{3s}^{2}{3p}^{6}{3d}^{10}{4s}^{2}{4p}^{4}
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(a) Period 4, p-block
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(b) Period 3, p-block
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(c) Period 4, d-block
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(d) Period 3, d-block
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The correct answer is: (a) Period 4, p-block
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43. Electropositivity of elements acros the periodic table normally
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(a) Remains constant down the group
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(b) Increases across the period
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(c) Decreases across the period
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(d) Decrease down the group
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The correct answer is: (c) Decreases across the period
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44. Consider the following table:
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Which of the substances is a liquid at room temperature and rapidly evaporates on exposure to air?
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(a) P
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(b) Q
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(c) R
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(d) S
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The correct answer is: (b) Q
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45. Which of the following oxide is amphoteric?
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(a) Carbon (II) oxide
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(b) Nitrogen (IV) oxide
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(c) Lead (II) oxide
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(d) Calcium oxide
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The correct answer is: (c) Lead (II) oxide
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46. Which of the following processes occur during fractional distillation of petroleum?
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(a) Condensation and diffusion
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(b) Diffusion and evaporation
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(c) Diffusion and sublimation
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(d) Evaporation and condensation
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The correct answer is: (d) Evaporation and condensation
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**47. If the molar mass of XHCO32is162gmol−1{X{HCO}_3}_{2} is 162g{mol}^{-1}, determine the relative atomic mass of X. [H = 1.0, C = 12.0, O = 16.0]
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(a) Energy is released when liquids change to solids
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(b) Particles move faster in the gaseous state than in the liquid state
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(c) Carbon atoms in gaseous methane are further apart than those in solid diamond
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(d) There is large decrease in the volume of a solid metal when pressure is applied to it
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The correct answer is: (d) There is large decrease in the volume of a solid metal when pressure is applied to it
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48. Charcoal is used in the decolourization of sugar because of its
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(a) Absorption property
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(b) Amorphous property
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(c) Oxidizing property
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(d) Adsorption property
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The correct answer is: (d) Adsorption property
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49. The first definition of an element was made by:
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(a) A.J.Dalton
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(b) B.A.Lavoisier
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(c) C. R. Boyle
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(d) D. J.J.Thomson
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The correct answer is: (c) C. R. Boyle
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50. Which of the following scientists formulated the law of conservation of mass?
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(a) A. Lavoisier
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(b) B. J.Dalton
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(c) C. R.Boyle
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(d) D. J.Proust
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The correct answer is: (a) A. Lavoisier
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Download WASSCE/WAEC Chemistry pdF (2022) Paper 2 (essay questions and answer 1 - 5)

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We have provided a pdf where you can practice wassce Paper 2 (essay questions) for Chemistry 2022. To download the pdf right away,
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Download WASSCE/WAEC Chemistry pdf (2023) Paper 3 (Practical questions and answer 1 - 3)

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We have also provided a pdf where you can practice wassce Paper 3 (practical) for chemistry 2022. To download the pdf right away,
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Without doubt I believe you are happy with the questions and answers on WASSCE/WAEC Chemistry 2022 you saw above. We have compiled this to ensure students have access to resources that can help them blast their WASSCE exam. If you have any comment or you observe any flaw do well to leave a comment in the comment-box below and we will get back to you
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I recommend you check my article on the following:
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- WASSCE/WAEC past questions and answers for CHEMISTRY-2023
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