2022–2023 WAEC GCE Chemistry Exam Questions and Solutions (Essay and Objectives)

2022 WAEC GCE Chemistry Exam Questions and Solutions. Thanks for visiting the 2022 WAEC Chemistry questions and Answers page. You may get WAEC GCE Chemistry Objective Answers, WAEC Chemistry Essay 2022, WAEC GCE Chemistry, and the advice you require to easily pass your WAEC GCE Chemistry test.Pegasus.cx Investment Review: Everything You Need To Know About Pegasus.cx Legit or Scam?

2022 WAEC GCE Chemistry Exam Questions and Solutions (Expo)

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Chemistry WAEC GCE 2022 Answers Loading

WAEC GCE Chemistry OBJ Answers for today:

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Note: The answers below are the 2020 Nov/Dec answers.

NOTE: Pls Trace It From Your Objective.

[If you see any options here pick it from your objectives]

1 Involves the loss and gain of electrons

2 Polymerisation

3 Global warming

4 3

5 Zinc ions

6 +1.56V

7 Ethene

8 NH3

9 Propanol

10 28

11 Hydrolysis

12 d-orbital

13 Lowering the activation energy

14 Closeness between reactant particles

15 Remaining the same with time

16 Reaction vessel Fels cool during the reaction

17 Faster

18 Solvent extraction

19 Saturated Solution

20 2.75mol/dm³

21 Partially dissociates in aqueous solution

22 138g

23 HI

24 2.00cm³

25 hydrogen chloride

26 strong electrovalent bond between ions

27 is not ductile

28 Electrons

29 C2H4

30 Aluminium

31 0.010mol/dm³

32 PbCO3

33 Linear

34 HCL and HOCL

35 +1

36 Ionic bond

37 have relatively low ionization energy

38 sour to taste

39 I,III and IV only

40 chrometography

41 2.00 dm

42 mole of solvent in 1dm³ of solution

43 does not contain neutron

44 1s²2s²2p⁶

45 Ammonium chloride

46 IV

47 I,II and IV only

48 Quantum numbers of Electrons

49 -273⁰C

50 Mass number

DDDADBBABA: 1-10

CDABDCCDDC: 11-20

ACDBDCCDAB: 21-30

BCADABDBAC: 31-40

ABB: 41-50

More Answers loading…

WAEC GCE Chemistry Theory Answers:

(1a)

(i) Sodium trioxonitrate (v) decahydrate

NaNO₃ . 10H₂O

(ii) Sodium Oxide –> Na₂O

(iii) Potassium tetraoxophospate (v) –> K₃PO₄

(1b)

Products formed are:

Hydrogen gas (a+ cathode)

Chlorine gas (a+ anode)

(1ci)

it decrease down the group

(1cii)

Ionization energy decreases as atomic radius decreases down the group due to the outermost electron’s attraction to its positive nucleus.

(1di)

Nitrogen and carbon (ii) oxide

(1dii)

it is used to heat furnace

(1diii)

it is a source of nitrogen for the manufacture of ammonia

(1ei)

Sodium hydrogen – used in qualitative analysis

– Purification of bauxite

(1eii)

Sodium trioxocarbonate (iv)

-Manufacture of glass

-As a water soften

(1j)

2-amino propane

(2ai)

Percentage C5H12 of mass m = 7.2g

Volume of O2 = 20.0dm³

(i) from the general combustion equation

CxHy(g) + (x+y/4)O2 –> XCO2 + y/2H2O

C5H12(l) + 802(g) –> 5CO2(g) + 6H2O(l)

(2aii)

1 mole of C5H12(72g) = 5 moles of CO2

At stop 7.2gC5H12 = x volume of CO2

X = 7.2g×5×22.4dm³/72g

X = 5×2.224 = 11.2dm³ of CO2

(2aiii)

Volume of oxygen left after the reaction from the equation of reaction

1 mole of C5H12(72g) = 8(22.4)dm³

7.2g = x

X = 7.2×8×22.4/72 = 17.92dm³

Volume of O2 left after the reaction

= 20.0dm³ – 17.92dm³

= 2.08dm³

(2b)

Molecules have kinetic energy when they clash with one another. The majority of energetic molecules, or those with higher kinetic energy, attempt to flee. Heat, an air wave passing over the container, an increase in the container’s surface area, or any combination of these things may help them escape. The average kinetic energy of the liquid’s molecules in the container decreases as they attempt to do this, which has the cooling effect because some molecules will lose energy on collision and fall back to the container.

(2ci)

Avogadro’s Law states that the total number of atoms/molecules of a gas (i.e. the amount of gaseous substance) is directly proportional to the volume occupied by the gas at constant temperature and pressure.

(2cii)

N2(g) + 3H2—> 2NH3

Where 1 mole = 30cm³ of gas

At constant temperature, the volume of a fixed mass of gas. When the volume of a cylinder or a container is increased, the gases have more space to travel and collide hence the pressure is reduced but as the volume is decreased or compressed the gases have less space to travel therefore more pressure is built up.

No (3ai)

¹³R, ⁸Q

¹³R=1s²,2s²,2p⁶,3s²,3p¹

⁸Q=1s²,2s²,2p⁴

(3aii)

¹³R=2,8,3

Valency of ¹³R is 3

⁸Q= 2,6

Valency of ⁸Q=2

(3di)

2H² SO4(aq)+4NaOH(aq)—>2Na² SO4(aq)+4H²O(s)

(3dii)

Sodium teraoxosulphate (iv) salt and water

(3diii)

The resulting solution NaSO4 is basic and will have no effect on litmus paper

(3div)

When heated to dryness it can be used as a dehydrating agent

(3di)

2H² SO4(aq)+4NaOH(aq)—>2Na² SO4(aq)+4H²O(s)

(3dii)

Sodium teraoxosulphate (iv) salt and water

(3diii)

The resulting solution NaSO4 is basic and will have no effect on litmus paper

(3div)

When heated to dryness it can be used as a dehydrating agent

Typing….

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The questions below are strictly for practice.

1. One of the following statements best explains the difference between a gas and a vapour?

(a) Unlike gases, vapours are liquids at room temperature

(b) Unlike gases, vapour can easily be condensed into liquids

(c) Unlike gases, vapour is readily converted into solids

(d) Vapours are generally denser than gases

2. Consider the following reaction equation: 2HCI + Ca(OH)2 → CaCI2 + H2O. what is the volume of 0.1 moldm-3, HCI that would completely neutralize 25cm3 or 0.3 moldm-3 Ca(OH)2?

(a) 150 cm3

(b) 75 cm3

(c) 30 cm3

(d) 25 cm3

 3. Cu and HNO3 are not suitable for preparing hydrogen gas because of their

(a) Reactivity and oxidation respectively

(b) conductivity and corrosiveness respectively

(c) melting point and reduction respectively

(d) electronegativity and solubility respectively

4. One of the following formulae can’t be an empirical formula?

(a) CH

(b) CH2

(c) P2O5

(d) N2O4

5. One of the criteria for confirming the purity of benzene is to determine its

(a) Heat capacity

(b) boiling point

(c) mass

(d) colour

6. When chlorine is passed through a sample of water, the pH of the water sample would be (a) <7

(b) >7

(c) = 7

(d) 0

7. How many atoms are contained in 0.2 moles of nitrogen [N = 6.02 x 1023]

(a) 1.20 x 1023

(b) 2.41 x 1023

(c) 3.62 x 1023

(d) 4.82 x 1023

8. The strength of metallic bonds depends on the

(a) charge density of the atoms

(b) ductility of the metal

(c) number of valence electrons

(d) total number of electrons in the atoms

9. When zinc is added to AgNO3 solution, crystals of silver forms on the zinc surface. This shows that zinc is

(a) oxidized

(b) reduced

(c) decomposed

(d) dissociated

10. The empirical formula of a compound containing 0.067 mol Cu and 0.066 mol O is [Cu = 63.5, O = 16.0]

(a) Cu2O

(b) CuO

(c) CuO2

(d) Cu2O2

11. The change in the oxidation state of iron in the reaction represented by the equation below is 2FeCI3 + H2S →2FeCI2 + 2HCI + S

(a) +2 to +3

(b) +3 to +2

(c) 0 to +2

(d) +3 to 0

12. One of the following methods can be used to separate blood cells from plasma?

(a) Centrifugation

(b) Filtration

(c) Chromatography

(d) Distillation

13. One of the following statements about ionic radius is right? ‘Ionic radius

(a) Increases as nuclear charge increases

(b) decreases as nuclear charge increases

(c) decreases as nuclear charges decreases.

(d) remains constant as nuclear charge increases

14. Analysis of a hydrocarbon shows that it contains 0.93 g of carbon per gram of the compound. The mole  ratio of carbon to hydrogen in the compound is [H=1.0, C=12.0]

(a) 1:1

(b) 1:2

(c) 2:1

(d) 2:3

15. The law of definite proportions states that

(a) pure samples of same compound contain the same elements combined in the same proportion by mass

(b) pure samples of substances are in the same proportion by mass

(c) chemical compounds are pure because they contain the same elements

(d) matter can neither be created nor destroyed

16. What is the relative molecular mass of a compound which has empirical formula CH2O? [H=1.0, C=12.0,0=16.0]

(a) 42

(b) 45

(c) 126

(d) 180

17. Atoms are electrically neutral because they

(a) don not conduct electricity

(b) contain equal number of protons and electrons

(c) are composed of neutrons and electrons

(d) cannot be attracted by electromagnetic field

18. Common salt (NaC1) is used for preserving foods. Which of the following properties could be used to determine its purity before use?

(a) Solubility in water

(b) melting point

(c) Relative density

(d) Crystalline nature

19. One among the following electron configurations represents the transition element chromium (24Cr)?

(a) 1s2 2s2 2p6 3s2 3p6 4s2 3d4

(b) 1s22 2s2 2p6 3s2 3p6 3d6

(c) 1s2 2s2 2p6 2s2 3d4 4s1 (d) 1s2 2s2 2p6 3s2 3p6 4s1 3d5

20. The atomic number of an isotope of hydrogen is same as its mass number because it

(a) has a totally filled valence shell

(b) has a high charge to mass ratio

(c) does not contain neutrons (d) exhibits isotopy

21. The total number of shared pair of electrons in the compound below is

(a) 5

(b) 6

(c) 10

(d) 12

22. The bonding pair of electrons in a hydrogen chloride molecule is pulled towards the chlorine atom because

(a) Chlorine has a larger atomic size

(b) chlorine has a large atomic mass

(c) chlorine is more electronegative

(d) there is no bonding orbitals within the hydrogen atom

23. The solubility of CO2 in water can be accounted for by

(a) van der waal’s forces

(b) ionic attraction

(c) dipole attraction

(d) covalent bonding

24. One of the following properties would not influence electrovalent bond information?

(a) Electronegativity

(b) Electron affinity

(c) Ionization potential

(d) Catalytic ability

25. Particles in a solid exhibit

(a) Vibrational motion only

(b) vibrational and translational motion

(c) vibrational and random motion

(d) random and translational motion

Chemistry Essay for WAEC GCE 2022

The questions and answers here are likely WAEC Physics repeated questions and answers rather than exact 2022 WAEC Chemistry questions and answers.

These inquiries are practice ones. Thirty minutes prior to the start of the WAEC GCE Chemistry test, the 2022 WAEC GCE Chemistry Expo will be published on this page. For the answers, return frequently to this page and refresh it.

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