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.Β 40
- B.Β 120
- C.Β 65
- D. 30
- A.Β energy is released when liquids change to solids.
- B.Β carbon atoms in gaseous methane are further apart than those in solid diamond.
- C.Β 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.Β CH3COOH+OHββH+βCH3COOβ+H2OπΆπ»3πΆπππ»+ππ»ββπ»+βπΆπ»3πΆππβ+π»2π
- B.Β CH3COOH+C2H5OHβH+βCH3COOC2H5+H2OπΆπ»3πΆπππ»+πΆ2π»5ππ»βπ»+βπΆπ»3πΆπππΆ2π»5+π»2π
- C.Β CH3COOC2H5+H2OβH+βCH3COOβ+CH3CH2OHπΆπ»3πΆπππΆ2π»5+π»2πβπ»+βπΆπ»3πΆππβ+πΆπ»3πΆπ»2ππ»
- D.Β CH3COOCH2CH3+H2OβH+βCH3COOH+CH3CH2OHπΆπ»3πΆπππΆπ»2πΆπ»3+π»2πβπ»+βπΆπ»3πΆπππ»+πΆπ»3πΆπ»2ππ»
4. The following steps are scientific methods except
- A.Β experimentation
- B.Β problem identification
- C.Β Analysis
- D. Open-mindedness
- A.Β the combustion of alkanes.
- B.Β the cracking of hydrocarbons.
- C.Β polymerization reactions.
- D.Β addition of hydrogen to unsaturated vegetable oils.
- A.Β polarity
- B.Β electrovalent bond.
- C.Β dipole
- D. metallic bond
Element | Ionization energy (KJΒ molβ1Γ10β3πππβ1Γ10β3) |
W | 12.0 |
X | 21.0 |
Y | 106.0 |
Z | 200.0 |
- A.Β Y and Z only
- B.Β X and Z only
- C.Β W and X only
- D. W and Z only
- A.Β Diffusion
- B.Β Melting
- C.Β Polymerization
- D. Evaporation
- A.Β it reacts with the product.
- B.Β it is highly corrosive.
- C.Β there is no visible reaction.
- D. it is a strong oxidizing agent.
- A.Β Addition reactions occur between alkanes and chlorine.
- B.Β Butane has a lower boiling point than propane.
- C.Β Pentane has five isomers.
- D.Β An alkane with 49 carbon atoms contains 100 hydrogen atoms
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- A.Β chromatography.
- B.Β crystallization.
- C.Β distillation.
- D. evaporation.
- A.Β Reactants
- B.Β Inhibitors
- C.Β Products
- D. Intermediates
- A.Β 0.0093 moles.
- B.Β 0.0930 moles.
- C.Β 0.0625 moles.
- D. 0.6250 moles.
- A.Β H2SO4(aq)π»2ππ4(ππ)
- B.Β NaOH(aq)ππππ»(ππ)
- C.Β H2CO3(aq)π»2πΆπ3(ππ)
- D. CH3COONH4(aq)πΆπ»3πΆπππ»4(ππ)
- A.Β C2H6πΆ2π»6Β andΒ C4H10πΆ4π»10
- B.Β C3H8πΆ3π»8Β andΒ C3H6πΆ3π»6
- C.Β C2H4πΆ2π»4Β andΒ C4H10πΆ4π»10
- D.Β C4H10πΆ4π»10Β andΒ C5H10
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- A.Β Ca(OH)2+Cl2βCaOCl2+H2OπΆπ(ππ»)2+πΆπ2βπΆπππΆπ2+π»2π
- B.Β Cl2+2NaFβ2NaCl+F2πΆπ2+2πππΉβ2πππΆπ+πΉ2
- C.Β Cl2+2NaOHβNaCl+NaClO+H2OπΆπ2+2ππππ»βπππΆπ+πππΆππ+π»2π
- D.Β H2S+Cl2β2HCl+Sπ»2π+πΆπ2β2π»πΆπ+π
- A.Β amphoteric.
- B.Β neutral
- C.Β basic
- D. acidic
- A.Β solvent extraction
- B.Β decantation
- C.Β fractional distillation
- D.Β filtration
2SO3(g)β2SO2(g)+O22ππ3(π)β2ππ2(π)+π2(g)
βH = +198 kJ/mol
Which of the following statements about the reaction is correct?
- A.Β 198 kJ of energy is given off
- B.Β The reaction is exothermic
- C.Β The reaction container would feel warm.
- D. 198 kJ of energy is absorbed
- A.Β HF,NH3ππ»3,Β SiH4πππ»4,Β CH4πΆπ»4
- B.Β CH4πΆπ»4,Β SiH4πππ»4, HF,Β NH3ππ»3,
- C.Β NH3ππ»3,CH4πΆπ»4,Β SiH4πππ»4, HF
- D.Β CH4πΆπ»4,Β SiH4πππ»4,Β NH3ππ»3, HF
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- A.Β are coloured
- B.Β are positively charged
- C.Β have vacant d-orbital
- D. have unpaired electrons
- A.Β Anions lose electrons
- B.Β Anions are oxidized
- C.Β Cations are oxidized
- D. Cations are discharged.
- A.Β presence of additives in petrol
- B.Β incomplete combustion of petrol
- C.Β presence of carbon in petrol
- D. contamination of petrol with diesel
- A.Β Dalton’s atomic theory
- B.Β Charle’s law
- C.Β Boyle’s law
- D. Gay- Lussac’s law
- A.Β 4
- B.Β 2
- C.Β 3
- D.Β 5
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- A.Β air pollution
- B.Β High Humidity
- C.Β flooding
- D. Water pollution
- A.Β ionization energy increases
- B.Β melting point increases
- C.Β shielding effect decreases
- D. electronegativity increases
- A.Β ethane
- B.Β methane
- C.Β butane
- D. propane
- A.Β nitrogen
- B.Β chlorine
- C.Β Carbon(IV) oxide
- D. Oxygen
- A.Β atomic radius
- B.Β ionization energy
- C.Β electron affinity
- D.Β electronegativity
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- A.Β 2.15 mol dm-3
- B.Β 0.74 mol dm-3
- C.Β 0.60 mol dm-3
- D. 0.57 mol dm-3
- A.Β a deliquescent salt
- B.Β a neutral salt
- C.Β an alkaline gas
- D. an acid anhydride
- A.Β Gases have low densities compared to solids and liquids of equal mass.
- B.Β The total kinetic energy of the gas is not affected by collision
- C.Β Molecules of the gas are in constant motion
- D. Gases are highly soluble in water at high temperatures
- A.Β 200cm3200ππ3
- B.Β 100cm3100ππ3
- C.Β 20cm320ππ3
- D.Β 400cm3400ππ3
- A.Β covalent bonds
- B.Β metallic bonds
- C.Β dative bonds
- D.Β ionic bonds
- A.Β 66.00
- B.Β 65.50
- C.Β 65.00
- D. 65.40
- A.Β Ineffective collision brings about chemical reaction
- B.Β All collisions bring about reactions
- C.Β The rate of reaction is proportional to the number of effective collisions
- D. Collision of molecules will split the molecules to react
- A.Β Aluminum
- B.Β Phosphorus
- C.Β Sodium
- D. Carbon
- A.Β applied chemistry
- B.Β Biochemistry
- C.Β Pure chemistry
- D. Environmental chemistry
- A.Β HCl
- B.Β NH3ππ»3
- C.Β Cl2πΆπ2
- D.Β H2O
Zn(s)+CuSO4(aq)βZnSO4(aq)+Cu(s)ππ(π )+πΆπ’ππ4(ππ)βππππ4(ππ)+πΆπ’(π )
- A.Β Zn(s)βZn2+(aq)+2eβππ(π )βππ(ππ)2++2πβ
- B.Β CuSO4(s)+H2O(l)πΆπ’ππ4(π )+π»2π(π)Β βΒ Cu2+(aq)πΆπ’(ππ)2+Β +Β SO2β4(aq)ππ4(ππ)2β
- C.Β Cu2+(aq)+2eββCu(s)πΆπ’(ππ)2++2πββπΆπ’(π )
- D.Β Cu2+(aq)+eββCu(s)πΆπ’(ππ)2++πββπΆπ’(π )
- A.Β are poisonous.
- B.Β pollute the gas
- C.Β are corrosive
- D. react with the gas
- A.Β ions
- B.Β electrons
- C.Β protons
- D. neutrons
[H=1.0, C=12.0, N = 14.0, O= 16.0]
- A.Β Nitrogen
- B.Β methane
- C.Β Ammonia
- D. Oxygen
- A.Β potassium trioxonitrate (V)
- B.Β sodium tetraoxosulphate (VI).
- C.Β iron (II) tetraoxosulphate (VI)
- D.Β sodium trioxocarbonate (IV).
- A.Β methyl orange
- B.Β phenolphthalein
- C.Β screened methyl orange
- D. methyl red
- A.Β 45
- B.Β 30
- C.Β 15
- D. 60
- A.Β is an exothermic process
- B.Β produces only small alkanes
- C.Β involves decomposition
- D. requires hydrogen
- A.Β 800.0g
- B.Β 0.02 g
- C.Β 20.0 g
- D. 0.80 g
- A.Β 2 moles
- B.Β 0.5moles
- C.Β 0.025moles
- D. 1 mole
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