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Instruction
JAMB Chemistry 2018
JAMB (UTME)
Chemistry
2018
Q6851.An aqueous solution of a metal salt M, gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia. Therefore, the cation in M is
AZn²⁺
BCa²⁺
CAl³⁺
DPb²⁺
Correct Answer: A
Zn²⁺ gives a white precipitate with NaOH that dissolves in excess NaOH (amphoteric). It also gives a white precipitate with aqueous ammonia that dissolves in excess ammonia (forming a complex ion). Ca²⁺ and Pb²⁺ do not dissolve in excess NaOH. Al³⁺ does not dissolve in excess ammonia.
JAMB (UTME)
Chemistry
2018
Q6852.What is the concentration of a solution containing 2g of NaOH in 100cm³ of solution?
Q6853.How many atoms are present in 6.0g of magnesium?
A1.20 × 10²²
B2.41 × 10²²
C1.51 × 10²³
D3.02 × 10²³
Correct Answer: C
Moles of Mg = 6.0/24 = 0.25 mol. Number of atoms = 0.25 × 6.02 × 10²³ = 1.505 × 10²³ ≈ 1.51 × 10²³.
JAMB (UTME)
Chemistry
2018
Q6854.The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
Acarbon-14
BPhosphorus-32
CCobalt-60
DIodine-131
Correct Answer: C
Cobalt-60 is used in industrial radiography to inspect welds and castings for internal faults.
JAMB (UTME)
Chemistry
2018
Q6855.Beryllium and Aluminium have similar properties because they
Aare both metals
Bbelong to the same group
Cbelong to the same period
Dare positioned diagonally to each other
Correct Answer: D
Beryllium and aluminium exhibit a diagonal relationship in the periodic table. Elements positioned diagonally to each other often have similar properties.
JAMB (UTME)
Chemistry
2018
Q6856.mE + nF ⇌ pG + qH
A[E]^m [F]^n / [G]^p [H]^q
B[E][F] / [G][H]
C[G]^p [H]^q / [E]^m [F]^n
D[G][H] / [E][F]
Correct Answer: C
The equilibrium constant K = [products]^coefficients / [reactants]^coefficients = [G]^p [H]^q / [E]^m [F]^n.
In all three reactions, ammonia reduces the other substance (CuO, Cl₂, O₂) and is itself oxidized to nitrogen. This demonstrates the reducing properties of ammonia.
JAMB (UTME)
Chemistry
2018
Q6858.The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is
ANa₂SO₄
BNa₂SO₃
CNa₂S
DNa₂CO₃
Correct Answer: B
Na₂SO₃ reacts with HCl to produce SO₂ gas, which has a pungent smell and decolourizes acidified KMnO₄ solution.
JAMB (UTME)
Chemistry
2018
Q6859.The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence in them of
Acarbon (IV) oxide
Bcarbon (II) oxide
Csoda
Dglucose
Correct Answer: A
The refreshing taste of soda water is due to dissolved carbon(IV) oxide (CO₂), which forms carbonic acid.
JAMB (UTME)
Chemistry
2018
Q6860.Which of the following are mixtures?
Ai, ii and iii
Bi, ii and iv
Ci and ii only
Di and iv
Correct Answer: A
Petroleum, rubber latex, and vulcanizer's solution are mixtures. Carbon(II) sulphide (CS₂) is a compound.
JAMB (UTME)
Chemistry
2018
Q6861.A balanced chemical equation obeys the law of
Aconservation of mass
Bdefinite proportions
Cmultiple proportions
Dconservation of energy
Correct Answer: A
A balanced chemical equation obeys the law of conservation of mass — the total mass of reactants equals the total mass of products.
JAMB (UTME)
Chemistry
2018
Q6862.A given amount of gas occupies 10.0 dm³ at 4 atm and 273°C. The number of moles of the gas present is
A0.89 mol
B1.90 mol
C3.80 mol
D5.70 mol
Correct Answer: A
Using ideal gas law: PV = nRT. P = 4 atm, V = 10.0 dm³, T = 273 + 273 = 546 K, R = 0.0821 dm³ atm K⁻¹ mol⁻¹. n = (4 × 10.0)/(0.0821 × 546) = 40/44.83 = 0.89 mol.
JAMB (UTME)
Chemistry
2018
Q6863.According to Charles' law, the volume of a gas becomes zero at
A0°C
B-100°C
C-273°C
D-373°C
Correct Answer: C
According to Charles's law, the volume of a gas decreases by 1/273 of its volume at 0°C for every 1°C decrease in temperature. It theoretically becomes zero at -273°C (absolute zero).
JAMB (UTME)
Chemistry
2018
Q6864.A substance that is used as a ripening agent for fruits is
Aethene
Bpropane
Cmethane
Dbutane
Correct Answer: A
Ethene (ethylene) is a plant hormone used commercially to hasten the ripening of fruits.
JAMB (UTME)
Chemistry
2018
Q6865.The Sulphide which is insoluble in dilute hydrochloric acid is
AFeS
BCuS
CZnS
DNa₂S
Correct Answer: B
CuS (copper(II) sulphide) is insoluble in dilute HCl because it has a very low solubility product. FeS, ZnS, and Na₂S are soluble in dilute HCl.
JAMB (UTME)
Chemistry
2018
Q6866.What is the pH of 0.001 moldm⁻³ solution of the sodium hydroxide?
A14
B13
C12
D11
Correct Answer: D
NaOH is a strong base, [OH⁻] = 0.001 M = 10⁻³ M. pOH = -log(10⁻³) = 3. pH = 14 - pOH = 14 - 3 = 11.
JAMB (UTME)
Chemistry
2018
Q6867.The type of bonding in [Cu(NH₃)₄]²⁺ is
Acoordinate
Belectrovalent
Cmetallic
Dcovalent.
Correct Answer: A
In [Cu(NH₃)₄]²⁺, the bond between Cu²⁺ and NH₃ is a coordinate (dative) covalent bond, where NH₃ donates a lone pair of electrons to Cu²⁺.
JAMB (UTME)
Chemistry
2018
Q6868.Which of the following is an example of a chemical change?
Adissolution of salt in water
Brusting of iron
Cmelting of ice
Dseparating a mixture by distillation
Correct Answer: B
Rusting of iron is a chemical change because it involves the formation of a new substance (hydrated iron(III) oxide). The others are physical changes.
JAMB (UTME)
Chemistry
2018
Q6869.To what temperature must a gas at 273K be heated in order to double both its volume and pressure?
A298K
B546K
C819K
D1092K
Correct Answer: D
Using combined gas law: (P₁V₁)/T₁ = (P₂V₂)/T₂. P₂ = 2P₁, V₂ = 2V₁, T₁ = 273 K. T₂ = (P₂V₂T₁)/(P₁V₁) = (2P₁ × 2V₁ × 273)/(P₁V₁) = 4 × 273 = 1092 K.
JAMB (UTME)
Chemistry
2018
Q6870.According to the Kinetic Theory, an increase in temperature causes the kinetic energy of particles to
Adecrease
Bincrease
Cbe zero
Dremain constant
Correct Answer: B
According to the kinetic theory, the average kinetic energy of particles is directly proportional to the absolute temperature. An increase in temperature increases the kinetic energy.
JAMB (UTME)
Chemistry
2018
Q6871.An element used in the production of matches is
Anitrogen
Baluminium
Ccopper
DSulphur
Correct Answer: D
Sulphur is used in the production of matches (match heads contain sulphur).
JAMB (UTME)
Chemistry
2018
Q6872.Which of the following gases may not be dried with concentrated sulphuric acid?
AHCl(g)
BNH₃
CCl₂
DSO₂
Correct Answer: B
Ammonia (NH₃) is a base and reacts with concentrated H₂SO₄ (an acid) to form ammonium sulphate. Therefore, it cannot be dried with concentrated H₂SO₄.
JAMB (UTME)
Chemistry
2018
Q6873.Consecutive members of an alkane homologous series differ by
ACH
BCH₂
CCH₃
DCnHn
Correct Answer: B
Consecutive members of a homologous series differ by a -CH₂- unit (methylene group), which corresponds to a mass difference of 14.
JAMB (UTME)
Chemistry
2018
Q6874.The compound that is used as an anaesthetic is
ACCl₄
BCHCl₃
CCH₂Cl₂
DCH₃Cl
Correct Answer: B
Chloroform (CHCl₃) was historically used as an anaesthetic.
JAMB (UTME)
Chemistry
2018
Q6875.The haloalkanes used in dry-cleaning industries are
Atrichloromethane and tetrachloromethane
Bchloroethene and dichloroethene
Ctrichloroethene and tetrachloroethene
Dchloroethane and dichloroethane
Correct Answer: A
Trichloromethane (chloroform) and tetrachloromethane (carbon tetrachloride) are used as solvents in dry cleaning.
JAMB (UTME)
Chemistry
2018
Q6876.Two hydrocarbons X and Y were treated with bromine water. X decolorized the solution and Y did not. Which class of compound does Y belong?
ABenzene
BAlkynes
CAlkenes
DAlkanes
Correct Answer: D
Alkanes do not decolorize bromine water because they are saturated and undergo substitution, not addition. Alkenes and alkynes decolorize bromine water by addition.
JAMB (UTME)
Chemistry
2018
Q6877.The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and
Atrichloromethane
Bdichloromethane
Ctetrachloromethane
Dchloromethane
Correct Answer: C
The reaction between methane and excess chlorine in the presence of UV light proceeds to completion, forming tetrachloromethane (CCl₄) and hydrogen chloride (HCl).
JAMB (UTME)
Chemistry
2018
Q6878.The correct order of increasing boiling points of the following compounds C₃H₇OH, C₇H₁₆ and C₄H₁₀ is
AC₃H₇OH → C₄H₁₀ → C₇H₁₆
BC₄H₁₀ → C₇H₁₆ → C₃H₇OH
CC₇H₁₆ → C₃H₇OH → C₄H₁₀
DC₄H₁₀ → C₃H₇OH → C₇H₁₆
Correct Answer: D
Boiling point increases with molecular mass in homologous series. C₄H₁₀ (butane, M=58) < C₃H₇OH (propanol, M=60 but has hydrogen bonding) < C₇H₁₆ (heptane, M=100).
JAMB (UTME)
Chemistry
2018
Q6879.One of the major uses of alkane is
Aas domestic and industrial fuel
Bin the hydrogenation of oils
Cin the textile industries
Din the production of plastics
Correct Answer: A
Alkanes (e.g., methane, propane, butane) are used as domestic and industrial fuels.
JAMB (UTME)
Chemistry
2018
Q6880.The compound that will react with sodium hydroxide to form salt and water is
AC₆H₁₂O₆
B(CH₃)₃COOH
CCH₃CH=CH₂
DCH₃CH₂COOH
Correct Answer: D
CH₃CH₂COOH (propanoic acid) is a carboxylic acid that reacts with NaOH to form a salt (sodium propanoate) and water.
JAMB (UTME)
Chemistry
2018
Q6881.Which of the following compounds in solution will turn red litmus paper blue?
Amethane
Bethane
Cpropane
Dbutane
Correct Answer: A
None of the alkanes (methane, ethane, propane, butane) will turn red litmus paper blue. They are neutral compounds. The correct answer is none of the above.
JAMB (UTME)
Chemistry
2018
Q6882.An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the empirical formula (C = 12, H = 1, O = 16)
AC₅H₁₂O
BC₃H₈O
CC₆H₁₃O₂
DC₄H₉O
Correct Answer: B
Moles ratio: C = 60/12 = 5, H = 13.3/1 = 13.3, O = 26.7/16 = 1.67. Divide by smallest (1.67): C = 3, H = 8, O = 1. Empirical formula = C₃H₈O.
JAMB (UTME)
Chemistry
2018
Q6883.The IUPAC nomenclature for the compound above is
A4-methylpent-1-ene
B3-methylpent-2-ene
C2-methylpent-1-ene
D2-methylpent-4-ene
Correct Answer: A
The structure is CH₃-CH(CH₃)-CH₂-CH=CH₂. The longest chain has 5 carbons (pentene) with a double bond at position 1 and a methyl group at position 4. The correct name is 4-methylpent-1-ene.
Instruction
JAMB Physics 2010
JAMB (UTME)
Physics
2010
Q6884.Which Physics Question Paper Type is given to you?
AType A
BType B
CType C
DType D
Correct Answer: B
The answer is B based on the provided answer key.
JAMB (UTME)
Physics
2010
Q6885.Two cars moving in the same direction have speeds of $100 \mathrm{kmh}^{-1}$ and $130 \mathrm{kmh}^{-1}$. What is the velocity of the faster car as measured by an observer in the slower car?
Q6886.The diagram above shows a velocity-time graph. The statement that is true about this motion is that, the car
Adecelerates between points F and H
Baccelerates between points F and G
Chas a constant speed between points E and F
Dhas no acceleration between point F and G.
Correct Answer: D
Between points F and G, the velocity is constant (horizontal line), meaning acceleration is zero.
JAMB (UTME)
Physics
2010
Q6887.A stone and a feather dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?
AThe stone and feather will both reach the ground at the same time.
BThe stone will reach the ground first
CThe feather will reach the ground first
DThe feather will be blown away by the wind while stone will drop steadily.
Correct Answer: A
In the absence of air resistance, all objects fall with the same acceleration due to gravity $g$.
JAMB (UTME)
Physics
2010
Q6888.A car moves with an initial velocity of $25 \mathrm{ms}^{-1}$ and reaches a velocity of $45 \mathrm{ms}^{-1}$ in $10 \mathrm{s}$. What is the acceleration of the car?
Q6889.An object is weighed at different locations on the earth. What will be the right observation?
ABoth the mass and weight vary
BThe weight is constant while the mass varies
CThe mass is constant while the weight varies
DBoth the mass and weight are constant.
Correct Answer: C
Mass is constant everywhere, but weight $W = mg$ varies with the value of $g$ at different locations.
JAMB (UTME)
Physics
2010
Q6890.The diagram above represents balls in an undulating surface. Which of the following options represents positions of stable equilibrium?
AII, V and VIII
BI, II and VII
CIII, VI and IX
DIII, IV and VIII
Correct Answer: C
Stable equilibrium positions are at the bottom of the dips (valleys), which are points III, VI, and IX.
JAMB (UTME)
Physics
2010
Q6891.A bob of weight $0.1 \mathrm{N}$ hangs from a massless string of length $50 \mathrm{cm}$. A variable horizontal force which increases from zero is applied to pull the bob until the string makes an angle of $60^{\circ}$ with the vertical. The work done is
Q6892.The surfaces of conveyor belts are made rough so as to
Aprevent the load from slipping
Bmake them stronger
Cmake them move faster
Dreduce friction
Correct Answer: A
Rough surfaces increase friction, which prevents loads from slipping.
JAMB (UTME)
Physics
2010
Q6893.A machine of velocity ratio $6$ requires an effort of $400 \mathrm{N}$ to raise a load of $800 \mathrm{N}$ through $1 \mathrm{m}$. Find the efficiency of the machine.
Q6894.If a wire $30 \mathrm{cm}$ long is extended to $30.5 \mathrm{cm}$ by a force of $300 \mathrm{N}$. Find the strain energy of the wire.
A$7.50 \mathrm{J}$
B$750.00 \mathrm{J}$
C$75.00 \mathrm{J}$
D$0.75 \mathrm{J}$
Correct Answer: D
Strain energy $= \dfrac{1}{2} \times F \times e = \dfrac{1}{2} \times 300 \times 0.005 = 0.75 \mathrm{J}$.
JAMB (UTME)
Physics
2010
Q6895.In a hydraulic press, the pump piston exerts a pressure of $100 \mathrm{Pa}$ on the liquid. What force is exerted in the second piston of cross-sectional area $3 \mathrm{m}^2$?
A$200 \mathrm{N}$
B$100 \mathrm{N}$
C$150 \mathrm{N}$
D$300 \mathrm{N}$
Correct Answer: D
$F = P \times A = 100 \times 3 = 300 \mathrm{N}$.
JAMB (UTME)
Physics
2010
Q6896.The accurate measurement of the relative density of a substance in its powdered form is done with a beam balance and
Aan eureka can
Ba burette
Ca pipette
Da density bottle.
Correct Answer: D
A density bottle is used for accurate determination of relative density of solids, especially powders.
JAMB (UTME)
Physics
2010
Q6897.A hydrometer is an instrument used in measuring
Adensity of liquid
Brelative density of a liquid
Crelative humidity of a liquid
Dvapour pressure of a fluid
Correct Answer: A
A hydrometer measures the density (or relative density) of a liquid. The answer key lists A, which is the most direct measurement.
JAMB (UTME)
Physics
2010
Q6898.One special advantage of alcohol water over mercury as a thermometric liquid is its
Alow freezing point
Blow boiling point
Chigh specific heat capacity
Dhigh expansivity
Correct Answer: A
Alcohol has a very low freezing point $\left(-115^{\circ}\mathrm{C}\right)$, making it suitable for measuring very low temperatures where mercury would freeze.
JAMB (UTME)
Physics
2010
Q6899.Two metals P and Q of lengths $l_1$ and $l_2$ are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is $2:3$ and the ratio of their lengths is $3:4$. What is the ratio of increase in lengths of P to Q?
A$5:7$
B$2:1$
C$1:2$
D$7:5$
Correct Answer: C
$\Delta L = L\alpha\Delta T$. $\dfrac{\Delta L_P}{\Delta L_Q} = \dfrac{L_P \alpha_P}{L_Q \alpha_Q} = \dfrac{3}{4} \times \dfrac{2}{3} = \dfrac{1}{2}$. Ratio is $1:2$.
JAMB (UTME)
Physics
2010
Q6900.The density of a certain oil on frying becomes $0.4 \mathrm{kgm}^{-3}$ with a volume of $20 \mathrm{m}^3$. What will be its initial volume when its initial density is $0.8 \mathrm{kgm}^{-3}$ assuming no loss of oil due to spillage?