JAMB UTME - Chemistry - 1982

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Question 4 Report

Which of the following equations represents an oxidizing action of sulphur dioxide?

SO₂ + 2HNO₂ → H₂SO₄ + 2NO₂ + heat

2SO₂ + 2H₂O + O₂ → 2H₂SO₄

SO₂ + 2H₂O + CI₂ → H₂SO₄ + 2HCI

SO₂ + 2H₂S → 3S + 2H₂O Correct answer

K₂Cr₂O₇ + H₂SO₄ + 3SO₂ → K₂SO₄ + Cr₂(SO₄)₃ + H₂O

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Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 5 Report

An element X has two isotopes, ²⁰₁₀X and ²⁰₁₀X,
present in the ratio 1:3. The relative atomic mass of X would be?

20.5

21.0

21.5 Correct answer

22.0

22.5

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Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 6 Report

How many grams of methylacetylene (propyne) CH₃ — C Ξ CH will completely discharge the colour of 8g of bromine?
(Br = 80, C = 12, H = 1)

0.5

1.0 Correct answer

2.0

3.0

4.0

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 7 Report

The product formed at the the cathode during the electrolysis of sodium chloride solution with carbon electrodes is?

sodium

chlorine

hydrogen Correct answer

sodium hydroxide

oxygen

Answer Details

Read lesson note on Electrolysis (JAMB)

Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)

Electrolysis

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Question 8 Report

When a pressure cooker is half filled with water, and heated to boiling point, then the pressure inside the cooker will?

decrease, since only a fraction of the water molecules has changed to vapour

remain constant, because the total number of water molecules has not changed

increase, because the water molecules can now reach every part of the sealed tube

decrease, since water boils under reduced pressure

increase, because the water vapour molecules now strike the walls of the tube more frequently because of their increased velocity Correct answer

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Question 9 Report

Which of the following is a neutralization reaction? Addition of

nitric acid to hydrochloric acid

nitric acid to sulphuric acid

nitric acid to distilled water

nitric acid to sodium hydroxide Correct answer

sodium chloride to distilled water

Answer Details

Read lesson note on Acids, Bases And Salts (JAMB)

Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts

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Question 10 Report

Sodium carbonate crystals on exposure to a dry atmosphere change to a white powder. This phenomenon is known as?

deliquescence

hygroscopy

oxidation

efforescence Correct answer

sublimation

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Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)

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Question 11 Report

If the rate of diffusion of oxygen gas is taken as 1, what will be rated of diffusion of methane whose relative molar mass is 16?

2.0

1.8

1.4 Correct answer

1.0

0.5

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

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Question 12 Report

Cotton is almost pure?

starch

protein

animal fibre

celluose Correct answer

mineral fibre

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Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Question 13 Report

What weight of sodium hydroxide is required to make 500 cm³ of 0.2 M solution?

(Na = 23, O = 16, H = 1)

40 g

20 g

10 g

4 g Correct answer

2 g

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Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 14 Report

An acid is said to be weak if?

its ions are so completely dissociated that they easily drift apart

the acid is not corrosive

the acid has low specific gravity

its ions move very slowly when in solution

its ions are incompletely dissociated Correct answer

Answer Details

Read lesson note on Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

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Question 15 Report

9.8g of solid potassium chlorate (KCIO₃) were added to 40 cm³ of water and heated to dissolve all the solid. As he solution cooled, crystals of potassium chlorate started forming at 60°C. The solubility of potassium chlorate at 66°C is therefore?

24.5 mole per dm³

0.2 mole per dm³

10.0 mole per dm³

20.0 mole per dm³

2.0 mole per dm³ Correct answer

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Read lesson note on Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

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Question 16 Report

A mixture contains 20cm³ of hydrogen, 35cm³ of oxygen, 15cm³ of carbon monoxide and 10cm³ of nitrogen at S.T.P. Which of the following gives the mole fraction of hydrogen in this mixture?

0.02

0.16

0.20

0.25 Correct answer

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

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Question 17 Report

0.07g of a hydride of carbon occupies 56.0cm³ at S.T.P. when vaporized and contains 14.29% by mass of hydrocarbon is(C = 12, H = 1)

CH₄

C₂H₂

C₂H₄ Correct answer

C₂H₆

C₃H₈

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Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Question 18 Report

Which of the following statements is incorrect?

Calcium reacts with water to form calcium

Magnesium reacts very slowly with water but faster with warm water

Iron will not react with water in the absence of air

Sodium reacts with water

Copper reacts with steam Correct answer

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Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)

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Question 19 Report

1.00 g of the oxide of metal X (atomic mass = 64) gave 0.80 g of the metal when reduced with hydrogen.
The formula of the oxide is?

X₂O

XO Correct answer

XO₂

X₂O₃

X₃O₄

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Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 20 Report

In the reaction NH₃ + H⁺ → NH₄⁺, the bond formed results from?

an electron transferred from NH₃ + H⁺

an electron pair donated by NH₃ Correct answer

an electron pair equally shared

an electron pair donated by H⁺

an electron tarnsferred from H⁺ to NH₃

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Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 21 Report

The nitrogen gas obtained by burning an excess of phosphorus in air has a density higher than the nitrogen from nitrogen compounds because the nitrogen from air is contaminated with?

some unburnt phosporus

P₂O₅ vapour

some oxygen

rare gases Correct answer

carbondioxide

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Read lesson note on Air (JAMB)

Air

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Question 22 Report

Which of the following types of reactions takes place between C₂H₄ and the halogens?

Substitution

Polymerization

Addition Correct answer

Saponification

Oxidation

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Question 23 Report

Which of the following CANNOT be obtained by fractional distillation of petroleum?

Ether

Methane

Butane

Ethene

Hydrogen Correct answer

Answer Details

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Question 24 Report

When a little brine was added to a metal nitrate a white precipitate was formed which first turned violet and then black on exposure to ai. The metal nitrate is therefore?

sodium nitrate

mercuric nitrate

lithium nitrate

silver nitrate Correct answer

potassium nitrate

Answer Details

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Question 25 Report

The number of grammes of potassium hydroxide in 250cm³ of one molar solution is?
(K = 39, O = 16, H = 1)

40g

52g

100g

26g

14g Correct answer

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Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

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Question 26 Report

If atom X with six electrons in its outermost shell combines with atom Y with one electron in its outermost shell to form an ionic compound, then?

six atoms of X will combine with one of Y

two atoms of X will combine with six of Y

one atom of X will combine with two of Y Correct answer

two atoms of X will combine with one of Y

one atom of X will combine with six of Y

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Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 27 Report

0.16g of methane when burnt raises the temperature of 100g of water by 40°C. What is the of combustion of methane when if the heat capacity of water is 4.2 Jg^-1°C^-1?

(CH₄ = 16)

1,160 kJ mol^-1

1,180 kJ mol^-1

1,560 kJ mol^-1

1,600kJ mol^-1

1,680 kJ mol^-1 Correct answer

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

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Question 28 Report

Brass is an alloy containing copper and?

zinc Correct answer

tin

aluminium

silver

lead

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Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 29 Report

Which of the following combinations of conditions may increase the rate of a chemical reaction?

Decrease in temperature, increase in concentration of the reactants

Increase in temperature, addition of a catalyst, decrease in the surface area of the reactants

Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactants Correct answer

Decrease in temperature concentration and surface area of the reactants

Additionof a catalyst and in the absence of light

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Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Question 30 Report

1.00g of mixture of calcium carbonate and calcium oxide liberated 0.33g of carbon dioxide on strong heating. The percentage of calcium oxide in the mixture is? (Ca = 40, C = 12, O = 16)

25 Correct answer

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Question 31 Report

When copper powder is heated with concentrated sulphuric acid, the gas produced is?

hydrogen sulphide

sulphur dioxide Correct answer

sulphur trioxide

hydrogen pentasulphide

sulphur pentoxide

Answer Details

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Question 32 Report

Magnesium ribbon was added to each of the following aqueous solution in turn: H₂SO₄, AgNO₃, HNO₃, HCl, NH₃, HCl, NH₃. In which case does the magnesium become covered with a dark precipitate?

H₂SO₄

AgNO₃ Correct answer

HNO₃

NH₃

HCl

Answer Details

Read lesson note on Chemical Bonds (Ghana Only) (WAEC)

Read lesson note on Periodic Chemistry (Ghana Only) (WAEC)

Chemical Bonds (Ghana Only)

Periodic Chemistry (Ghana Only)

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Question 33 Report

When a solution of silver (l) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is?

H₂S

Ag₂S Correct answer

PbS

HNO₃

Answer Details

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Question 34 Report

An amphoteric oxide is an?

amorphous oxide of a metal

amorphous oxide of a non-mental

oxide that is insoluble in water

oxide that behaves both as a base as well as an acid Correct answer

oxide that loses its oxygen on sublimation

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Acids, Bases And Salts

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Question 35 Report

Which of the following is NOT a redox reaction?

2HNO₂ + 2HI → 2H₂O + 2NO + I₂

Zn + H₂SO₄ → ZnSO₄ + H₂

Ca(HCO₃)₂ → CaCO₃ + H₂O + CO₂ Correct answer

4FeO + O₂ → 2Fe₂O₃

2Na + Cl₂ → 2NaCl

Answer Details

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Question 36 Report

A current of 10.0A was passed for 1 hour through a solution of copper (ll) sulphate between the copper electrodes. Which of the following observation would be correct?
(1 Faraday = 96,500 coulobms) (i) 0.186 mole of copper is dissolved from the anode. (ii) 0.372 mole of copper is deposited on the cathode. (iii) the original Cu²⁺ ion concentration of the solution remains unchanged. (iv) the original Cu²⁺ ion concentration of the solution decreases.

i and ii

i and iii Correct answer

i and iv

ii and iii

ii and iv

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 37 Report

Which of the following represents ethyl ethanonate?

CH₃CH₂CO₂CH₃

(CH₃CO₂)₂O

CH₃CH₂CO₂CH₂CH₃

CH₃CO₂CH₂CH₃ Correct answer

CH₃CH₂COCH₂CH₃

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Question 38 Report

In the chemical reaction A + B \(\to\) C + D, more of D is formed?

if the concentrated of A is reduced

if the concentrated of B is reduced

if the concentrated of C is reduced

if the concentration of C is increased

if D is continuously removed from the reaction mixture Correct answer

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 39 Report

Water is poured over a white solid and a colourless neutral gas is evolved which burns with a sooty flame. The white solid is?

calcium

calcium oxide

calcium carbide Correct answer

sodium peroxide

sodium sulphate

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 40 Report

The i.u.p.A.C name for the compound

2-chloro-isopentane

3-chloro-isopentane

2-chloro-2-methylbutane Correct answer

1-chloro-2,2- dimethylpropane

2-chloro-2-ethylpropane

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Question 41 Report

The production of ammonia by the haber process may be represented by the equilibrium equation N₂(g) + 3H₂(g) ↔ 2NH₃ ∆H = -22KJ. Therefore the production of ammonia will be favoured by?

only high pressure

only high temperature

a combination of high temperature and low pressure

a combination of low temperature and high pressure Correct answer

low pressure

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Read lesson note on Chemical Equilibria (JAMB)

Chemical Equilibria

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Question 42 Report

Which of the following statements is correct during the electrolysis of a caustic soda solution using platinum electrodes?

Oxygen gas is given off at the cathode

Hydrogen gas is given of at the anode

Sodium metals is deposited at the anode

Sodium metal is deposited at the cathode

AAlkalinity at the cathode increases Correct answer

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Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 43 Report

When air is passed through alkaline pyrogallol and then over quicklime, the only gases left are?

nitrogen and carbondoxide

the rare gases

nitrogen and oxygen

nitrogen and the rare gases Correct answer

nitrogen, carbonioxide and the rare gases

Answer Details

Read lesson note on Air (JAMB)

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Air

Separation Of Mixtures And Purification Of Chemical Substances

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Question 44 Report

The solubility curve of a solid X (molecular mass = 160) is as show above. 1,000 cm3 of a saturated solution of X at 80°C is cooled to 40°C . The weight of X crystalized out would be

10 g

12 g

14 g

16 g Correct answer

18 g

Answer Details

Read lesson note on Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

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Question 45 Report

The pressure on 100 cm³ of oxygen gas at 35°C is 750mm of Hg.What would be the volume of the gas if the pressure is increased to 1000mm of Hg without changing the temperature?

133.3 cm³

85 cm³

75 cm³ Correct answer

65 cm³

58.3 cm³

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

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Question 46 Report

In the reaction N₂(g) + O(g)
↔ 2NO(g) produced i an increase in the total pressure will?

cause less nitrogen to be produced in the equilibrium mixture

cause less nitric oxide to be produced in the equilibrium mixture

cause more nitric oxide to be produced in the equilibrium mixture

cause more oxygen to be produced in the equilibrium mixture

have no effect Correct answer

Answer Details

Read lesson note on Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

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Question 47 Report

If the temperature of a gas is increased?

the kinetic energy of the emolecules will decrease

the pressure will decrease if the volume is constant

the gas will occupy a greater volume if the pressure is constant Correct answer

the mass of the gas will decrease

the pressure and volume will increase

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

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Question 48 Report

100 cm³ of oxygen is made to react with 50 cm ³ of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?

5 cm³

25 cm³

50 cm³

75 cm³ Correct answer

100 cm³

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)