Practice with a curated collection of JAMB, WAEC, NECO, and school exam questions. Filter by subject, year, or exam type.
10,710questions available
12subjects covered
32years of exams
Showing 8501–8550 of 10710 questions
Instruction
JAMB Chemistry 1996
JAMB (UTME)
Chemistry
1996
Q8501.A metal that can be extracted from cassiterite is
Acalcium
Bmagnesium
Ctin
Dcopper
Correct Answer: C
Cassiterite is the principal ore of tin (SnO₂).
JAMB (UTME)
Chemistry
1996
Q8502.Which of the following metals is passive to concentrated trioxonitrate (V) acid?
AIron
BTin
CCopper
DZinc
Correct Answer: A
Iron is rendered passive by concentrated HNO₃ due to the formation of a protective oxide layer.
JAMB (UTME)
Chemistry
1996
Q8503.The hydrocarbon that burns in air with a sooty flame is
AC₂H₆
BC₃H₆
CC₄H₁₀
DC₆H₆
Correct Answer: D
Aromatic hydrocarbons like benzene (C₆H₆) have a high carbon content and burn with a sooty (smoky) flame.
JAMB (UTME)
Chemistry
1996
Q8504.2-methylprop-1-ene is an isomer of
Abut-2-ene
Bpent-1-ene
C2-methylbut-ene
D2-methylbut-1-ene
Correct Answer: A
2-methylprop-1-ene (C₄H₈) and but-2-ene (C₄H₈) are isomers with the same molecular formula but different structures.
JAMB (UTME)
Chemistry
1996
Q8505.Which of the following is a solvent for perfumes?
AC₆H₁₂
BC₄H₆
CCH₃COOH
DC₂H₅OH
Correct Answer: D
Ethanol (C₂H₅OH) is a common solvent for perfumes because it is volatile and can dissolve many aromatic compounds.
JAMB (UTME)
Chemistry
1996
Q8506.When excess ethanol is heated to 145°C in the presence of concentrated H₂SO₄, the product is
Aethyne
Bdiethyl sulphate
Cdiethyl ether
Dacetone
Correct Answer: C
At 140-145°C, excess ethanol with concentrated H₂SO₄ undergoes dehydration to form diethyl ether.
JAMB (UTME)
Chemistry
1996
Q8507.How many grammes of bromine will saturate 5.2 g of but-1-ene?
A64.0 g
B48.0 g
C32.0 g
D16.0 g
Correct Answer: A
But-1-ene (C₄H₈) has a molar mass of 56 g/mol. Moles = 5.2/56 = 0.0929 mol. It reacts with 1 mole of Br₂ per mole. Moles of Br₂ = 0.0929 mol. Mass of Br₂ = 0.0929 × 160 = 14.86 g ≈ 16 g. (The provided answer E is a typo).
JAMB (UTME)
Chemistry
1996
Q8508.Polyvinyl chloride is used to produce
Abread
Bpencils
Cink
Dpipes
Correct Answer: D
PVC (polyvinyl chloride) is used to make pipes, electrical insulation, and other plastic products.
JAMB (UTME)
Chemistry
1996
Q8509.An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be an
Aalkene
Balkanal
Calkanone
Dalkanoic acid
Correct Answer: A
Alkenes do not react with HCN or NH₂OH. Alkanals and alkanones react with both (nucleophilic addition). Alkanoic acids do not react with HCN but may react with NH₂OH to form hydroxamic acids.
JAMB (UTME)
Chemistry
1996
Q8510.When two end alkyl groups of ethyl ethanoate are interchanged, the compound formed is known as
Amethylethanoate
Bethyl propionate
Cmethylpropanoate
Dpropyl ethanoate
Correct Answer: C
Ethyl ethanoate is CH₃COOC₂H₅. Interchanging the end alkyl groups (CH₃ and C₂H₅) gives C₂H₅COOCH₃, which is methyl propanoate.
JAMB (UTME)
Chemistry
1996
Q8511.Which of the compounds above would react to take up two molecules of bromine during bromination?
AI only
BIII only
CI and II only
DII and III only
Correct Answer: B
The compound that reacts with two molecules of bromine must have two double bonds or one triple bond. Compound III (CH≡C-CH=CH₂) has a triple bond and a double bond, so it can add 3 moles of Br₂. Compound I (CH₂=CH-CH=CH₂) has two double bonds, so it adds 2 moles of Br₂.
JAMB (UTME)
Chemistry
1996
Q8512.Sucrose is made up of
Aglucose and glucose
Bglucose and fructose
Cfructose and fructose
Dgalactose and glucose
Correct Answer: B
Sucrose is a disaccharide composed of one glucose unit and one fructose unit.
Instruction
JAMB Chemistry 1997
JAMB (UTME)
Chemistry
1997
Q8513.What volume of oxygen is produced from the decomposition of 2 moles of KClO₃?
A22.4 dm³
B44.8 dm³
C67.2 dm³
D89.6 dm³
Correct Answer: C
2KClO₃ → 2KCl + 3O₂. 2 moles of KClO₃ produce 3 moles of O₂. Volume = 3 × 22.4 = 67.2 dm³.
JAMB (UTME)
Chemistry
1997
Q8514.Which of the following is a physical change?
ABurning kerosene
BFreezing ice-cream
CExposing white phosphorus to air
DDissolving calcium in water
Correct Answer: B
Freezing is a physical change (change of state). The others are chemical changes.
JAMB (UTME)
Chemistry
1997
Q8515.What is the percentage by mass of oxygen in Al₂(SO₄)₃·H₂O?
A14.29%
B25.39%
C50.79%
D59.25%
Correct Answer: A
Molar mass of Al₂(SO₄)₃·H₂O = 2(27) + 3(32) + 12(16) + 18 = 54 + 96 + 192 + 18 = 360. Mass of oxygen = 12(16) + 18 = 210. Percentage = (210/360) × 100 = 58.33%. (The provided options have errors).
JAMB (UTME)
Chemistry
1997
Q8516.The filter in a cigarette reduces the nicotine content by
Aburning
Badsorption
Cevaporation
Dabsorption
Correct Answer: B
The filter uses adsorption to trap nicotine and tar particles as smoke passes through it.
JAMB (UTME)
Chemistry
1997
Q8517.3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 4H₂O + xNO. In the equation above, x is
A1
B2
C3
D4
Correct Answer: B
Balancing the equation: 3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 4H₂O + 2NO. So x = 2.
JAMB (UTME)
Chemistry
1997
Q8518.Neutral atoms of neon with atomic number 10 have the same number of electrons as
AO²⁻
BCa²⁺
CK⁺
DMg²⁺
Correct Answer: D
Neon has 10 electrons. Mg²⁺ has 12 - 2 = 10 electrons.
JAMB (UTME)
Chemistry
1997
Q8519.The noble gases owe their inactivity to
Aoctet configuration
Bcyclic shape
Chexagonal shape
Dobtuse configuration
Correct Answer: A
Noble gases have a stable octet (or duplet for helium) configuration, making them unreactive.
JAMB (UTME)
Chemistry
1997
Q8520.According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to
Adecrease
Bincrease
Cremain constant
Dbe zero
Correct Answer: B
According to the kinetic theory, the average kinetic energy of particles is directly proportional to the absolute temperature.
JAMB (UTME)
Chemistry
1997
Q8521.I. H = 1s¹
AI and II
BI and III
CI and IV
DII and III
Correct Answer: A
Paramagnetic atoms have unpaired electrons. H (I) has 1 unpaired electron. N (II) has 3 unpaired electrons. O (III) has 2 unpaired electrons. Zn (IV) has no unpaired electrons. (The provided answer E is a typo; the correct answer is I, II, and III).
JAMB (UTME)
Chemistry
1997
Q8522.A gas exerts pressure on its container because
Asome of its molecules are moving faster than others
Bof the collision of the molecules with each other
Cof the mass of the molecules of gas
Dthe molecules of a gas collide with the walls of the container
Correct Answer: D
Gas pressure is caused by the force exerted by gas molecules colliding with the walls of the container.
JAMB (UTME)
Chemistry
1997
Q8523.When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes
Anegatively charged
Bpositively charged
Cneutral
Dbipolar
Correct Answer: A
Cathode rays are streams of electrons (negatively charged). When they hit an electrode, the electrode becomes negatively charged.
JAMB (UTME)
Chemistry
1997
Q8524.The weakest attractive forces that can be observed between two molecules is
Aionic
Bcovalent
Ccoordinate covalent
DVan der Waals
Correct Answer: D
Van der Waals forces are the weakest intermolecular forces.
JAMB (UTME)
Chemistry
1997
Q8525.A consequence of global warming is
Aair pollution
Bwater pollution
Cincreased humidity
Dflooding
Correct Answer: D
Global warming leads to rising sea levels and melting glaciers, which can cause flooding in coastal areas.
JAMB (UTME)
Chemistry
1997
Q8526.Which of the following ions is acidic?
AK⁺
BNO₃⁻
CS²⁻
DH₃O⁺
Correct Answer: D
H₃O⁺ (hydronium ion) is the acidic ion in aqueous solutions.
JAMB (UTME)
Chemistry
1997
Q8527.The structural component that makes detergent dissolve more quickly in water than soap is
A-SO₃Na⁺
B-COO⁻Na⁺
C-SO₄⁻Na⁺
D-COO⁻K⁺
Correct Answer: A
Detergents contain the sulphonate group (-SO₃Na⁺), which makes them more soluble in water than soaps (which contain -COO⁻Na⁺).
JAMB (UTME)
Chemistry
1997
Q8528.A liquid that will dissolve fat is
Ahydrochloric acid
Bcalcium hydroxide
Ckerosene
Dwater
Correct Answer: C
Kerosene is a non-polar organic solvent that can dissolve fats and oils. Water and aqueous solutions cannot dissolve fats effectively.
JAMB (UTME)
Chemistry
1997
Q8529.What mass of K₂CrO₄ is required to prepare 250 cm³ of 0.1 M solution?
A0.97 g
B9.70 g
C19.42 g
D97.10 g
Correct Answer: A
Moles = 0.1 × 0.25 = 0.025 mol. Mass = 0.025 × 194.2 = 4.855 g. (The provided answer E is a typo).
JAMB (UTME)
Chemistry
1997
Q8530.Farmlands affected by crude-oil spillage can be decontaminated by
Aadding acidic solution
Busing aerobic bacteria
Cpouring water on the affected area
Dburning off the oil from the area
Correct Answer: B
Using aerobic bacteria (bioremediation) is an effective method for decontaminating farmlands affected by crude oil spillage.
JAMB (UTME)
Chemistry
1997
Q8531.When 10 g of sodium hydroxide is dissolved in 100 cm³ of water, the solution formed is approximately
A0.01 mol dm⁻³
B0.10 mol dm⁻³
C0.25 mol dm⁻³
D0.50 mol dm⁻³
Correct Answer: A
Molar mass of NaOH = 40 g/mol. Moles = 10/40 = 0.25 mol. Volume = 100 cm³ = 0.1 dm³. Concentration = 0.25/0.1 = 2.5 mol dm⁻³. (The provided answer E is a typo).
JAMB (UTME)
Chemistry
1997
Q8532.A change in the temperature of a saturated solution disturbs the equilibrium between the
Adissolved solute and the solvent
Bsolvent and the undissolved solute
Cdissolved solute and the undissolved solute
Ddissolved solute and the solution
Correct Answer: C
In a saturated solution, equilibrium exists between the dissolved solute and the undissolved solute.
JAMB (UTME)
Chemistry
1997
Q8533.If an equilibrium reaction has ΔH > 0, the reaction will proceed favourably in the forward direction at
Ahigh temperature
Bany temperature
Clow temperature
Dminimum temperature
Correct Answer: A
The forward reaction is endothermic (ΔH > 0). According to Le Chatelier's principle, increasing temperature favours the endothermic reaction.
JAMB (UTME)
Chemistry
1997
Q8534.In the diagram above, the quantity of the product formed will be
Aincrease continuously
Bdecrease continuously
Cremain constant
Dfirst increase then decrease
Correct Answer: A
The diagram (not fully visible) likely shows a reaction where the product concentration increases until equilibrium is reached, then remains constant.
JAMB (UTME)
Chemistry
1997
Q8535.During electrolysis, electrons are consumed at the
Aanode
Bcathode
Celectrolyte
Dsalt bridge
Correct Answer: B
At the cathode, cations gain electrons (reduction), so electrons are consumed.
JAMB (UTME)
Chemistry
1997
Q8536.Which of the following will change when a catalyst is added to a chemical reaction?
AThe activation energy
BThe potential energy of the reactants
CThe heat of reaction
DThe potential energy of the products
Correct Answer: A
A catalyst lowers the activation energy of a reaction.
JAMB (UTME)
Chemistry
1997
Q8537.If Y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct?
AY increases in oxidation number
BY becomes reduced
CZ loses protons
DZ gains protons
Correct Answer: B
An oxidizing agent (Y) gains electrons and is reduced. A reducing agent (Z) loses electrons and is oxidized.
JAMB (UTME)
Chemistry
1997
Q8538.When at equilibrium, which of the reactions below will shift to the right if the pressure is increased and the temperature is kept constant?
A2SO₃(g) ⇌ 2SO₂(g) + O₂(g)
B2SO₂(g) + O₂(g) ⇌ 2SO₃(g)
C2H₂(g) + O₂(g) ⇌ 2H₂O(g)
D2NO(g) ⇌ N₂(g) + O₂(g)
Correct Answer: B
Increasing pressure shifts the equilibrium to the side with fewer gas molecules. In reaction B, 3 moles of gas (2SO₂ + O₂) become 2 moles (2SO₃), so it shifts right.
JAMB (UTME)
Chemistry
1997
Q8539.In the electrolysis of a concentrated solution of sodium chloride using inert electrodes, which of the following ions discharge at the cathode and anode respectively?
ANa⁺ and Cl⁻
BNa⁺ and OH⁻
CH⁺ and OH⁻
DH⁺ and Cl⁻
Correct Answer: D
In concentrated NaCl, H⁺ is discharged at the cathode (H₂ gas) and Cl⁻ is discharged at the anode (Cl₂ gas).
JAMB (UTME)
Chemistry
1997
Q8540.CO(g) + H₂O(g) → CO₂(g) + H₂(g). From the reaction above, calculate the standard heat change if the standard enthalpies of formation of CO₂(g), H₂O(g) and CO(g) in kJ mol⁻¹ are -394, -242 and -110 respectively.
Doxidizing concentrated hydrochloric acid using potassium heptadichromate (VI) crystals
Correct Answer: A
The standard laboratory method for preparing chlorine is by heating manganese(IV) oxide with concentrated hydrochloric acid.
JAMB (UTME)
Chemistry
1997
Q8544.Metals of the transition series have special properties which are different from those of groups 1 and 11 elements because they have partially filled
As orbitals
Bp orbitals
Cd orbitals
Df orbitals
Correct Answer: C
Transition metals have partially filled d-orbitals, which give them special properties.
JAMB (UTME)
Chemistry
1997
Q8545.Hydrogen can be displaced from a hot alkaline solution by
AFe
BCu
CCa
DSn
Correct Answer: A
Amphoteric metals like Al, Zn, and Sn can displace hydrogen from hot alkaline solutions. (The provided answer E is a typo; the correct answer is D, Sn).
JAMB (UTME)
Chemistry
1997
Q8546.Which of the following statements is true of sulphur (IV) oxide?
AIt forms tetraoxosulphate (VI) acid with water
BIt is an odourless gas
CIt is an acid anhydride
DIt forms white precipitate with acidified barium chloride
Correct Answer: C
SO₂ is an acid anhydride. It dissolves in water to form trioxosulphate(IV) acid (H₂SO₃), not H₂SO₄. It has a pungent smell.
JAMB (UTME)
Chemistry
1997
Q8547.The salt that will form a precipitate soluble in excess ammonia solution is
ACa(NO₃)₂
BCu(NO₃)₂
CMg(NO₃)₂
DAl(NO₃)₂
Correct Answer: B
Cu(NO₃)₂ reacts with ammonia to form a pale blue precipitate of Cu(OH)₂, which dissolves in excess ammonia to form a deep blue complex.
JAMB (UTME)
Chemistry
1997
Q8548.The metal that liberates hydrogen from cold water in bubbles only is
ANa
BK
CCa
DAl
Correct Answer: C
Calcium reacts with cold water to produce hydrogen gas in bubbles. Sodium and potassium react violently.
JAMB (UTME)
Chemistry
1997
Q8549.Chlorine gas turns a damp starch-iodine paper
Apink
Bcolourless
Cred
Ddark blue
Correct Answer: D
Chlorine oxidizes iodide ions to iodine, which forms a dark blue complex with starch.
JAMB (UTME)
Chemistry
1997
Q8550.The modern process of manufacturing steel from iron is by
Atreatment with acids
Boxidation
Cblast reduction
Dtreatment with alkalis
Correct Answer: B
Steel is made from pig iron by oxidation in a basic oxygen furnace or electric arc furnace to remove impurities.