Chemistry WAEC Past Questions 2024 [OBJECTIVE]
Chemistry WAEC past questions is now here for you to aid you with your studies. Past questions are very important for students who are preparing to write their exams as they can use it to test their knowledge and see if all they have heard is entering their head.
Another good thing about past questions is that it can also help you know if you have covered the full syllabus oor have things that have not been covered. Without waste of time, let’s get started
Chemistry WAEC Past Questions 2024
Below are the complete questions that you might likely see on your next Chemistry WAEC examination.
[H=1.0, C=12.0, O= 16.0]
- A. 40
- B. 120
- C. 65
- D. 30
- A. energy is released when liquids change to solids.
- B. carbon atoms in gaseous methane are further apart than those in solid diamond.
- C. there is large decrease in the volume of a solid metal when pressure is applied to it.
- D. particles move faster in the gaseous state than in the liquid state.
- A. CH3COOH+OH−⇌H+⇌CH3COO−+H2O𝐶𝐻3𝐶𝑂𝑂𝐻+𝑂𝐻−⇌𝐻+⇌𝐶𝐻3𝐶𝑂𝑂−+𝐻2𝑂
- B. CH3COOH+C2H5OH⇌H+⇌CH3COOC2H5+H2O𝐶𝐻3𝐶𝑂𝑂𝐻+𝐶2𝐻5𝑂𝐻⇌𝐻+⇌𝐶𝐻3𝐶𝑂𝑂𝐶2𝐻5+𝐻2𝑂
- C. CH3COOC2H5+H2O⇌H+⇌CH3COO−+CH3CH2OH𝐶𝐻3𝐶𝑂𝑂𝐶2𝐻5+𝐻2𝑂⇌𝐻+⇌𝐶𝐻3𝐶𝑂𝑂−+𝐶𝐻3𝐶𝐻2𝑂𝐻
- D. CH3COOCH2CH3+H2O⇌H+⇌CH3COOH+CH3CH2OH𝐶𝐻3𝐶𝑂𝑂𝐶𝐻2𝐶𝐻3+𝐻2𝑂⇌𝐻+⇌𝐶𝐻3𝐶𝑂𝑂𝐻+𝐶𝐻3𝐶𝐻2𝑂𝐻
4. The following steps are scientific methods except
- A. experimentation
- B. problem identification
- C. Analysis
- D. Open-mindedness
- A. the combustion of alkanes.
- B. the cracking of hydrocarbons.
- C. polymerization reactions.
- D. addition of hydrogen to unsaturated vegetable oils.
- A. polarity
- B. electrovalent bond.
- C. dipole
- D. metallic bond
Element | Ionization energy (KJ mol−1×10−3𝑚𝑜𝑙−1×10−3) |
W | 12.0 |
X | 21.0 |
Y | 106.0 |
Z | 200.0 |
- A. Y and Z only
- B. X and Z only
- C. W and X only
- D. W and Z only
- A. Diffusion
- B. Melting
- C. Polymerization
- D. Evaporation
- A. it reacts with the product.
- B. it is highly corrosive.
- C. there is no visible reaction.
- D. it is a strong oxidizing agent.
- A. Addition reactions occur between alkanes and chlorine.
- B. Butane has a lower boiling point than propane.
- C. Pentane has five isomers.
- D. An alkane with 49 carbon atoms contains 100 hydrogen atoms
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- A. chromatography.
- B. crystallization.
- C. distillation.
- D. evaporation.
- A. Reactants
- B. Inhibitors
- C. Products
- D. Intermediates
- A. 0.0093 moles.
- B. 0.0930 moles.
- C. 0.0625 moles.
- D. 0.6250 moles.
- A. H2SO4(aq)𝐻2𝑆𝑂4(𝑎𝑞)
- B. NaOH(aq)𝑁𝑎𝑂𝐻(𝑎𝑞)
- C. H2CO3(aq)𝐻2𝐶𝑂3(𝑎𝑞)
- D. CH3COONH4(aq)𝐶𝐻3𝐶𝑂𝑂𝐻4(𝑎𝑞)
- A. C2H6𝐶2𝐻6 and C4H10𝐶4𝐻10
- B. C3H8𝐶3𝐻8 and C3H6𝐶3𝐻6
- C. C2H4𝐶2𝐻4 and C4H10𝐶4𝐻10
- D. C4H10𝐶4𝐻10 and C5H10
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- A. Ca(OH)2+Cl2→CaOCl2+H2O𝐶𝑎(𝑂𝐻)2+𝐶𝑙2→𝐶𝑎𝑂𝐶𝑙2+𝐻2𝑂
- B. Cl2+2NaF→2NaCl+F2𝐶𝑙2+2𝑁𝑎𝐹→2𝑁𝑎𝐶𝑙+𝐹2
- C. Cl2+2NaOH→NaCl+NaClO+H2O𝐶𝑙2+2𝑁𝑎𝑂𝐻→𝑁𝑎𝐶𝑙+𝑁𝑎𝐶𝑙𝑂+𝐻2𝑂
- D. H2S+Cl2→2HCl+S𝐻2𝑆+𝐶𝑙2→2𝐻𝐶𝑙+𝑆
- A. amphoteric.
- B. neutral
- C. basic
- D. acidic
- A. solvent extraction
- B. decantation
- C. fractional distillation
- D. filtration
2SO3(g)→2SO2(g)+O22𝑆𝑂3(𝑔)→2𝑆𝑂2(𝑔)+𝑂2(g)
∆H = +198 kJ/mol
Which of the following statements about the reaction is correct?
- A. 198 kJ of energy is given off
- B. The reaction is exothermic
- C. The reaction container would feel warm.
- D. 198 kJ of energy is absorbed
- A. HF,NH3𝑁𝐻3, SiH4𝑆𝑖𝐻4, CH4𝐶𝐻4
- B. CH4𝐶𝐻4, SiH4𝑆𝑖𝐻4, HF, NH3𝑁𝐻3,
- C. NH3𝑁𝐻3,CH4𝐶𝐻4, SiH4𝑆𝑖𝐻4, HF
- D. CH4𝐶𝐻4, SiH4𝑆𝑖𝐻4, NH3𝑁𝐻3, HF
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- A. are coloured
- B. are positively charged
- C. have vacant d-orbital
- D. have unpaired electrons
- A. Anions lose electrons
- B. Anions are oxidized
- C. Cations are oxidized
- D. Cations are discharged.
- A. presence of additives in petrol
- B. incomplete combustion of petrol
- C. presence of carbon in petrol
- D. contamination of petrol with diesel
- A. Dalton’s atomic theory
- B. Charle’s law
- C. Boyle’s law
- D. Gay- Lussac’s law
- A. 4
- B. 2
- C. 3
- D. 5
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- A. air pollution
- B. High Humidity
- C. flooding
- D. Water pollution
- A. ionization energy increases
- B. melting point increases
- C. shielding effect decreases
- D. electronegativity increases
- A. ethane
- B. methane
- C. butane
- D. propane
- A. nitrogen
- B. chlorine
- C. Carbon(IV) oxide
- D. Oxygen
- A. atomic radius
- B. ionization energy
- C. electron affinity
- D. electronegativity
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- A. 2.15 mol dm-3
- B. 0.74 mol dm-3
- C. 0.60 mol dm-3
- D. 0.57 mol dm-3
- A. a deliquescent salt
- B. a neutral salt
- C. an alkaline gas
- D. an acid anhydride
- A. Gases have low densities compared to solids and liquids of equal mass.
- B. The total kinetic energy of the gas is not affected by collision
- C. Molecules of the gas are in constant motion
- D. Gases are highly soluble in water at high temperatures
- A. 200cm3200𝑐𝑚3
- B. 100cm3100𝑐𝑚3
- C. 20cm320𝑐𝑚3
- D. 400cm3400𝑐𝑚3
- A. covalent bonds
- B. metallic bonds
- C. dative bonds
- D. ionic bonds
- A. 66.00
- B. 65.50
- C. 65.00
- D. 65.40
- A. Ineffective collision brings about chemical reaction
- B. All collisions bring about reactions
- C. The rate of reaction is proportional to the number of effective collisions
- D. Collision of molecules will split the molecules to react
- A. Aluminum
- B. Phosphorus
- C. Sodium
- D. Carbon
- A. applied chemistry
- B. Biochemistry
- C. Pure chemistry
- D. Environmental chemistry
- A. HCl
- B. NH3𝑁𝐻3
- C. Cl2𝐶𝑙2
- D. H2O
Zn(s)+CuSO4(aq)→ZnSO4(aq)+Cu(s)𝑍𝑛(𝑠)+𝐶𝑢𝑆𝑂4(𝑎𝑞)→𝑍𝑛𝑆𝑂4(𝑎𝑞)+𝐶𝑢(𝑠)
- A. Zn(s)→Zn2+(aq)+2e−𝑍𝑛(𝑠)→𝑍𝑛(𝑎𝑞)2++2𝑒−
- B. CuSO4(s)+H2O(l)𝐶𝑢𝑆𝑂4(𝑠)+𝐻2𝑂(𝑙) → Cu2+(aq)𝐶𝑢(𝑎𝑞)2+ + SO2−4(aq)𝑆𝑂4(𝑎𝑞)2−
- C. Cu2+(aq)+2e−→Cu(s)𝐶𝑢(𝑎𝑞)2++2𝑒−→𝐶𝑢(𝑠)
- D. Cu2+(aq)+e−→Cu(s)𝐶𝑢(𝑎𝑞)2++𝑒−→𝐶𝑢(𝑠)
- A. are poisonous.
- B. pollute the gas
- C. are corrosive
- D. react with the gas
- A. ions
- B. electrons
- C. protons
- D. neutrons
[H=1.0, C=12.0, N = 14.0, O= 16.0]
- A. Nitrogen
- B. methane
- C. Ammonia
- D. Oxygen
- A. potassium trioxonitrate (V)
- B. sodium tetraoxosulphate (VI).
- C. iron (II) tetraoxosulphate (VI)
- D. sodium trioxocarbonate (IV).
- A. methyl orange
- B. phenolphthalein
- C. screened methyl orange
- D. methyl red
- A. 45
- B. 30
- C. 15
- D. 60
- A. is an exothermic process
- B. produces only small alkanes
- C. involves decomposition
- D. requires hydrogen
- A. 800.0g
- B. 0.02 g
- C. 20.0 g
- D. 0.80 g
- A. 2 moles
- B. 0.5moles
- C. 0.025moles
- D. 1 mole
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