chemistry essay and objective waec 2021

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Chemistry 2021 WAEC Past Questions

The hydrolysis of proteins by diluting mineral acids produces 

• C. amino acids
• D. fatty acids

Which of the following oxide causes acid rain?

• C. H\(_{2}\)O\(_{2}\)
• D. NO\(_{2}\)

The ratio of carbon atoms of hydrogen atoms in a hydrocarbon is 1:2. If its molecular mass is 56, what is its molecular formula?

• A. C\(_{3}\)H\(_{6}\)
• B. C\(_{4}\)H\(_{8}\)
• C. C\(_{2}\)H\(_{4}\)
• D. CH\(_{2}\)

What is the relative molecular mass of the compound below?

[H = 1.0; C = 12.0; O = 16.0]

Cathodic protection of metals is based on

• A. standard electrode potential of hydrogen
• B. its electrical conductivity
• C. nature of oxides formed
• D. relative tendencies of oxidation
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Waec 2021/2022 waec Chemistry Essay/Theory And Obj(Objectives) Questions and Answers Expo Runz (Runs)/Dubs/Chokes

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WAEC Past Questions & Answer: CHEMISTRY 2021

Welcome to our WAEC past question and answer series. In this post, we will be sharing Chemistry 2021 past questions and their answers for various subjects. Stay tuned enjoy while learning.

1. The hydrolysis of proteins by diluting mineral acids produces

A. sucrose B. glucose C. amino acids D. fatty acids

2. Which of the following oxide causes acid rain?

A. CO B. NO C. H2O2 D. NO2

3. The ratio of carbon atoms of hydrogen atoms in a hydrocarbon is 1:2. If its molecular mass is 56, what is its molecular formula?

A. C3H6 B. C4H8 C. C2H4 D. CH2

4. What is the relative molecular mass of the compound below? What is the relative molecular mass of the compound below [H = 1.0; C = 12.0; O = 16.0] – SchoolNGR [H = 1.0; C = 12.0; O = 16.0]

A. 137 B. 136 C. 64 D. 59

5. Cathodic protection of metals is based on

A. standard electrode potential of hydrogen B. its electrical conductivity C. nature of oxides formed D. relative tendencies of oxidation

6. If humid air is polluted by chlorine discharged, the air can be restored by sprinkling

A. solid MnO2 B. acidified KMnO4 C. acidified FeSO4 D. saturated NaCl(aq)

7. The alkanol represented by the structure below is

A. primary and dihydric B. secondary and monohydric C. tertiary and dihydric D. secondary and dihydric

8. Which of the following pairs of compounds would form a precipitate when their aqueous solutions are mixed?

A. NaCl and KNO3 B. KCL and NaNO3 C. K2SO4 and BaCl2 D. NH4NO3 and CO3

9. Which of the following illustrates the variation of the rate of evolution of gas from a given length of magnesium ribbon (y-axis) with an increase in the concentration of the added (x-axis)?

A. I B. II C. III D. IV

10. Which of the graphs illustrates the variation of the pH of a given volume of strong acid solution (y-axis) with the volume of strong base titrated against its (x-axis)?

11. which of the graphs illustrates the variation of the solubility of a salt in water (y-axis), with an increase in temperature (x-axis) if the dissolution process is exothermic, 12. the formation of ethene from dehydration of ethanol can be described as——-.

A. an addition reaction B. an elimination reaction C. an oxidation reaction D. a substitution reaction

13. Which of the following gasses is highly soluble in water at room temperature

A. ammonia B. carbon (IV) oxide C. chlorine D. nitrogen

14. A molecular of phosphorus is

A. diatomic B. triatomic C. tetraatomic D. monoatomic

15. The most common method of preparing insoluble salts is by

A. filtration B. decomposition C. neutralisation D. double decomposition

16. What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm2 cylinder? [R = 0.082 atm dm3 mol−1 K−1]

A. 0.32 B. 1.56 C. 3.13 D. 31.25

17. The basic property of salts used as drying agents is by?

A. efflorescence B. high melting point C. hygroscopy D. low solubility

18. What would be observed when aqueous ammonia is added in drops and then in excess to a solution of copper(II) ions?

A. blue precipitate is formed which is soluble in excess ammonia B. brick red precipitate is produced which is insoluble in excess ammonia C. which precipitate is formed which is excess in ammonia D. green precipitate is formed which is insoluble in excess ammonia

19. When CuSO4(aq) is added to Pb(NO3)2(aq)——–

A. there would be no visible change B. a blue precipitate would be formed C. the resulting solution would become colourless D. a white precipitate would be formed

20. Consider the structure below How many carbon atoms does the parent chain contain?

A. 5 B. 4 C. 3 D. 2

21. Under which conditions of pressure (p) and temperature (T) would the volume of an inflated ballon increase? When

A. P and T are increased B. both T and P are decreased C. T is increased and P is decreased D. T is decreased and P is increased

22. The collision between ideal gas molecules are considered to be perfectly elastic because

A. they collide without losing energy B. they move randomly in a straight line C. their average kinetic energy is variable D. the distance between them is large compared to their size

23. Elements with high ionisation energies would——-

A. lose electrons easily B. have large atomic radii C. have high effective nuclear charges D. have low atomic numbers

24. Which of the following statements about Group VII elements is correct?

A. they are present in the same physical state B. they are strong reducing agents C. their reactivity decreases down the group D. they exist as monoatomic molecules

25. Consider the following diagram and use it to answer the question below Which of the following cell notations represent the diagram

A. B2+/B/ /A/A3+ B. A3+ /A/ /B/B2+ C. B/B2+/ /A/3+ D. A/A3+/ /B2+/B

26. Which of the following half reaction equations represent the reaction at the cathode

A. A3+(aq)+3e− → A(s) B. B2+(aq)+2e− → B(s) C. A(s) → 3+(aq)+3e− D. B(s) → B2+(aq) + 2e−

27. The reactivity of fluorine is high because of

A. its high electronegativity B. the small size of the fluorine atom C. the availability of d-orbitals D. the strong F-F bond

28. How many coulombs of electricity would liberate 1.08g of Ag from a solution of silver salt? [Ag = 108.0; 1F = 96500 C]

A. 96500 C B. 9650 C C. 965 C D. 9.65 C

29. The Bohr model of the atom proposed the existence of?

A. the nucleus B. electron shells C. nucleons D. neutrons

30. The 25°C evaporation of a 100 cm3 solution of K2CO3 to dryness gave 14g of the salt. What is the solubility of K2CO3 at 25°25C? [K2CO3 = 138]

A. 0.01 mol dm−3 B. 0.101 mol dm−3 C. 1.01 mol dm −3 D. 10.0 mol dm−3

31. Student X titrated 25 cm3 of Na2CO3 with 0.1 mol dm−3 HCI, using methyl orange as indicator. Student Y carried out the same exercise but used phenolphthalein as an indicator. Which of the following statements about the titration is true?

A. hydrogen chloride gas was released in the reactions in both titrations B. the titer values obtained from the titration are equal C. the tirer value obtained by X is twice that of Y C. the titer value obtained by Y is twice that of X

32. What is the concentration of a solution which contains 0.28g of potassium hydroxide in 100 cm3 of solution [KOH = 56]

A. 0.01 mol dm−3 B. 0.05 mol dm−3 C. 0.10 mol dm−3 D. 0.50 mol dm−3

33. What is the empirical formula of a hydrocarbon containing 0.160 moles of carbon and 0.640 moles of hydrogen

A. CH2 B. CH3 C. CH4 D. C2H4

34. Which of the following species has the largest ionic radius

A. S2− A. K+ B. CI− D. Ca2+

35. Which of the following statements is correct about ionisation energy? It

A. decreases across the periods B. results in the formation of an anion C. causes Metalic nuclei to disintegrate D. decreases down the group

36. Potassium trioxonitrate (V) can be obtained from its solution by———-

A. distillation B. evapoartion C. crystallisation D. filtration

37. An element, Q, contains 69% of63Q and 31% of 65Q. What is the relative atomic mass of Q?’

A. 63.0 B. 63.6 C. 65.0 D. 69.0

38. The following ions have the same electron configuration except 8O, 12Mg, 13AI, 17CI

A. CI− B. O2− C. Mg2+ D. AI3+

39. The region around the nucleus where electrons can be located is called?

A. a spectra B. an orbital C. a quanta D. a field

40. Protons and electrons are called fundamental particles because they———-

A. are indivisible B. have different charges C. are the lightest particles D. are found in all matter

41. The activation energy of the reaction is

A. EA B. EB C. EC D. ED

42. The enthalpy change of the reaction is————

43. the energy profile diagram illustrates————-.

A. an endothermic reaction B. an exothermic reaction C. a spontaneous reaction D. a redox reaction

44. How many molecules of oxygen would occupy a volume of 2.24 cm3 at s.t.p? [Molar volume at s.t.p = 22,400 cm3, Avogadro’s number = 6.02 x 1023]

A. 3.01 x 1020 B. 3.01 x 1027 C. 6.02 x 1019 D. 6.02 x 1027

45. The isotopes of neon are represented by the symbols 20x Ne, 21 y Ne, and 22 z Ne. The relationship between x, y, and z is?

A. x > y > z B. x < y < z C. x = y= z D. x < z < y

46. Which of the following pairs of molecules form hydrogen bonds?

A. C2H5OH and CH3OH B. CH3OH and H2 C. H2S and CH4 D. NH3 and SO2

47. Which of the following statements about elements in Group VII is correct?

A. Br2 will oxidise CI− B. F2 has the least tendency to be reduced C. Cl2 will oxidise I− D. l2 is a stronger oxidising agent than F2

48. Electrovalent compounds normally ————

A. have low boiling points B. have mobile electrons C. conduct electricity in the solid state D. dissolve in polar solvent

49. A coordinate covalent bond could be formed between?

A. NH3 and PCl3 B. BCl3 and AlCl3 C. BCl3 and NH3 D. H+ and AlCl3

50. Which of the following scientists discovered the electrons?

A. Joseph J. Thompson B. James Chadwick C. Amedeo Avogadro D. Ernest Rutherford

Answers To Questions

Bamidele Oladimeji

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WAEC Past Questions & Answer: CHEMISTRY 2018

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CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

Chemistry Theory And Objective: Questions  & Answers For 2022/2023 WAEC Exam. Are you a student who wants to make a good grade in Chemistry? Here are the WAEC Chemistry questions and everything you need to know about 2021 WAEC Chemistry. This post provides provided for you with all you need to know in Chemistry Paper 1 (Objective) and Chemistry 2 (Essay).

Table of Contents

Welcome to the Chemistry Theory and Objective: Questions & Answers for the 2022/2023 WAEC Exam. This comprehensive guide has been designed to assist students in their preparation for the upcoming WAEC Chemistry examination. It presents a collection of theory and objective questions along with their corresponding answers, covering the essential topics and concepts outlined in the WAEC syllabus. By studying and practicing these questions, you will gain a solid foundation in chemistry and improve your chances of achieving excellent results in the exam. So let’s delve into the world of chemistry and embark on a journey of learning and success.

The Question & Answers: CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

Furthermore, below are the WAEC Chemistry questions. Read them properly. In fact, they will make you ready to score high in your WAEC Chemistry exam.

The West Africa Examination Council (WAEC) is an examination body in Nigeria. It has the statutory power to conduct the Senior Secondary Certificate Examination in May/June and the General Certificate in Education in November/December.

THE OBJECTIVE OF POST: CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

Because people are asking about WAEC Chemistry and objective questions and answer 2022/2023. In fact, they are also asking for JAMB 2022 CHEMISTRY questions and answers pdf, The solutions are the objectives of this post. This post, therefore, takes care of those students who plan to do well in the WAEC exams this year.

The best way to read this post is to read it by clicking the highlighted topics for referencing. So check out these related topics that follow.

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CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

General tips and advice to help you prepare for your exams effectively..

• Study the syllabus: Familiarize yourself with the syllabus for your respective exams. Understand the topics and concepts that are likely to be covered and focus your preparation accordingly.
• Review past papers: Practice solving past exam papers to get an idea of the types of questions that may be asked. This will help you become familiar with the exam format and identify any areas where you need further improvement.
• Understand the concepts: Chemistry involves understanding fundamental concepts and principles. Ensure you have a strong foundation by studying the theory thoroughly. Take notes, create summaries, and use diagrams or visual aids to help you grasp complex concepts.
• Practice problem-solving: Chemistry often requires application and problem-solving skills. Practice solving numerical problems and chemical equations regularly to strengthen your problem-solving abilities. This will also help you become more familiar with the calculations and techniques needed for the exam.
• Seek clarification: If you come across any challenging topics or concepts, don’t hesitate to seek clarification from your teachers, classmates, or online resources. Understanding the material thoroughly will boost your confidence during the exam. CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM..
• Create a study schedule: Plan your study sessions and allocate sufficient time to each topic based on its importance and your level of understanding. Break down your study material into manageable chunks and set realistic goals to stay motivated.
• Collaborate with peers: Consider forming study groups with classmates or friends who are also preparing for the exams. Discussing and explaining concepts to each other can enhance your understanding and retention of the material.
• Utilize available resources: Take advantage of textbooks, reference materials, online resources, and educational platforms that provide study materials, practice questions, and tutorials specific to your exam. These resources can provide valuable insights and additional practice opportunities. CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.
• Practice time management: During the exam, time management is crucial. Practice solving questions within the allocated time limits to improve your speed and accuracy. This will ensure that you can complete the exam within the given time frame.
• Stay focused and maintain a healthy lifestyle: Avoid distractions and create a conducive study environment. Take regular breaks, exercise, eat nutritious meals, and get enough sleep to keep your mind and body in optimal condition for studying.

Remember, success in any exam is a result of consistent effort, effective preparation, and a positive mindset. Good luck with your exams!

WAEC Chemistry Questions and Answers 2022:

Furthermore, the questions below are the WAEC Chemistry Questions. Going through them will make you ready to score high in your WAEC 2021 Chemistry Examination. Congratulations.

• How many alkoxy alkanes can be obtained from the molecular formula C4 H4O4

ANSWER: C (3)

• Element Y has two isotopes Y and Y present in the ratio 1:3. The relative atomic mass of Y would be

ANSWER: C (21.5)

• What condition favors the formation of the product for the endothermic reaction, N2O4(g) —><—– 2NO2(g)

A. Decrease in pressure

B. A decrease in volume

C. An increase in pressure

D. A constant volume

ANSWER: A ( Decrease in pressure)

• Elements X and Y have electronic configurations 1S22S22P4 and 1S22S22P63S23P1 respectively. When they combine the formula of the compound formed is

ANSWER: B (Y2X3)

CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM

• A solution of 0.20 mole of NaBr and 0.20 mole of MgBr2 in 2.0 dm3 of water is to be analyzed. How many moles of Pb(NO3 )2 must be added to precipitate all the bromide as insoluble PbBr2

A. 0.30 mol

B. 0.10 mol

C. 0.20 mol

D. 0.40 mol

ANSWER: A (0.30 mol)

• Na2CO3 + HCl —-> NaHCO3 + NaCl. The indicator most suitable for this reaction should have pH equal to.

ANSWER: D (9)

• A saturated solution of silver trioxocarbonate (IV), was found to have a concentration of 1.30 x 10-5 moldm-3 . The solubility product of the trioxocarbonate (IV) is

A. 8.79 x 10-15

B. 1.69 x 10-10

C. 1.82 x 10-11

D. 9.84 x 10-10

ANSWER: A (8.79 x 10-15)

QUESTIONS & ANSWERS FOR THE 2022/2023 WAEC EXAM

• 100.0g of KClO3 was added to 40.0 cm^3 of water to give a saturated solution at 298K. If the solubility of the salt is 20.0 moldm^-3 at 298K, what percentage of the salt is left undissolved? {K= 39, Cl = 35.5, O = 16}
• Tetraoxosulphate (VI) ions are the final test using

A. acidified silver nitrate

B. acidic barium chloride

C. lime water

D. dilute hydrochloric acid

ANSWER: D (dilute hydrochloric acid)

• When platinum electrodes are used during the electrolysis of copper (II) tetraoxosulphate (IV) solution, the solution gets progressive

D. Atmospheric

ANSWER: A (Acidic)

WAEC 2022/2023 Chemistry Theory Questions

PAPER 2 (ESSAY) SECTION A

• (a) When calcium oxide and coke are heated in an electric furnace, the products are carbon (ii) oxide and calcium carbide (CaC2), write the equation for this reaction.

(b) The addition of water to calcium carbide leads to the formation of calcium hydroxide and ethyne. Write the equation for the production of ethyne.

• Calculate the percentage by mass of silicon tetrachloride. [2 marks]
• Ammonia, NH3, and phosphine, Ph3, are the hydrides of the first two elements in group 5. (a) Draw a dot and cross diagram for the ammonia molecule. [2 marks] (b) Sketch and explain the shape of the ammonia molecule. [3 marks]
• The first ionization energy of chlorine is +1260KJmol-1. (a) Define the term first ionization energy. (b) State and explain the general trend in the values of the first ionization energy for the elements across the period, sodium to argon in the periodic table.
• Compound A consists of carbon and hydrogen only. The compound was found to contain 80% carbon by mass. (a) Calculate the empirical formula of compound A using the data above. (b) The relative molecular mass of compound A was found to be 30. Use this information to deduce the molecular formula of compound A. [H = 1.00 C = 12.00]
• State two factors other than a change in temperature or the use of a catalyst that influence the rate of a chemical reaction.
• Identify the solid remaining when each of the following is heated. (a) lithium trioxonitrate (V) (b) potassium trioxonitrate (V) (c) calcium trioxonitrate (V)

CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For the 2022/2023 WAEC EXAM

• An aqueous solution has a pH of 4.0. (a) (i) What is the hydrogen ion concentration of the solution? (ii) What effect will it have on litmus paper? (iii) Which of the following salt solutions would have the same effect on litmus? Give a reason for your answer. NH4Cl(aq); NaCl(aq) ; CH3OON(aq). (b) (i) Differentiate between a fine chemical and a heavy chemical. (ii) Name two sources of air pollution. (iii) Suggest one way of reducing air pollution in cities
• (a) (i) Explain briefly the fermentation process. (ii) Write a balanced equation for the fermentation of glucose. (iii) What substance must be added to glucose solution to ferment it? (iv) Explain briefly why tightly corked glass filled to the brim with palm wine shatters on standing. (b) State one industrial application of each of the following methods of separation: (i) Crystallization; (ii) Fractional distillation. (c) Explain the following terms: (i) Saponification; (ii) Esterification. (d) Write a balanced equation to illustrate each of the terms in (c). (e) i) What is hydrocarbon compound? (ii) Name two principal sources of hydrocarbons.

QUESTIONS & ANSWERS FOR 2022/2023 WAEC EXAM

• (a) Two elements represented by the letters Q and R have atomic numbers 9 and 12 respectively. (i) Write the electron configuration of R. (ii) To what group does Q belong in the periodic table? (iii) Write the formula of the compound formed when Q combines with R. (iv) Explain briefly, why Q is a good oxidizing agent. (v) State whether R would be expected to form acidic or basic oxide. (b) (i) State two assumptions of the kinetic theory of gases. (ii) When some solids are heated, they change directly into the gaseous state. What name is given to this phenomenon? (iii) List two substances that exhibit the phenomenon mentioned in (ii). (iv) Write an expression to show the mathematical relationship between the rate of diffusion of a gas and its vapor.

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HOW TO PARTNER WITH US: CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

In conclusion, mastering the Chemistry theory and objectives is crucial for success in the upcoming 2022/2023 WAEC exam. By diligently studying and understanding the key concepts, practicing with a wide range of questions, and seeking clarification when needed, students can enhance their understanding of this fascinating subject. Remember, a strong foundation in Chemistry will not only boost your performance in the exam but also equip you with valuable knowledge for future academic pursuits. Stay focused, stay determined, and embark on this journey with confidence. Best of luck in your preparations and may you excel in the upcoming WAEC exam! CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

Finally, for those who would want to win a scholarship and at times part-time studies, this website is for you. For career professional tutorials for ICAN, CITN, NBA exams, etc. this site is available for your current information. Therefore, send us your questions through the comment box. And keep in touch with us by filling in the email list box below for further updates. Our social media buttons will also help if you like us on then or follow us. Thanks Get ready with CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

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WAEC chemistry past questions and answers (PDF) free

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