JAMB UTME - Chemistry - 1980 | Green Bridge CBT

Question 1 Report

A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an iron cathode. In the course of the electrolysis the electrolyte is continuously stirred. The liquid left after electrolysis will therefore consist of?

sodium hydroxide solution

chlorine water Correct answer

pure water

sodium hypochlorite solution

hydrochloric acid solution

Answer Details

Read lesson note on Electrolysis (JAMB)

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

Electrolysis

Acids, Bases And Salts (Ghana Only)

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Question 2 Report

Which of the following classes of organic compounds undergoes rapid oxidation with bromine water?

alcohols

alkenes Correct answer

carboxylic acids

esters

alkanes

Answer Details

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Question 3 Report

When chlorine gas is passed into a solution of sulphur dioxide?

sulphur dioxide is reduced to sulphur

the chlorine is oxidized to hydrochloric acid

dilute sulphuric acid and hydrochloric acid are produced Correct answer

Hydrochloric acid and sulphur are produced

sulphur trioxide is the only product

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 4 Report

Which of the following statements is an exception in the assumptions of the kinetic theory of gases?

Gases are composed of many elastic particles

The particles are of negligible size

The particles are in constant random motion

The particles are of negligible mass Correct answer

The particles collide with each other

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 5 Report

If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litre of water,and resulting solution mixed thoroughly, the resulting sulpuric acid concentration will be?

2.2 M

1.1 M

O.22 M Correct answer

0. 11 M

0.20 M

Answer Details

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

Acids, Bases And Salts (Ghana Only)

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Question 6 Report

The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?

oxidation Correct answer

hydrolysis

dissociation

reduction

disproportionation

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 7 Report

An endothermic reaction is one during which heat is.....and can be represented by the symbol.... which of the following combinations can be used accurately to complete the above definition?

liberated, -\(\Delta\)H

liberated, +\(\Delta\)H

absorbed, -\(\Delta\)H

absorbed, +\(\Delta\)H Correct answer

absorbed, +\(\Delta\)G

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Question 8 Report

The following arrangement of elements in order of decreasing number of outer electrons; One of the elements is wrongly placed. Which is it? ALUMINIUM, CHLORINE, SILICON, MAGNESIUM AND SODIUM.

chlorine

aluminium Correct answer

silicon

magnesium

sodium

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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

Atomic Structure And Bonding

Periodic Chemistry (Nigeria Only)

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Question 9 Report

When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?

turn moist red litmus paper blue

turn lime water milky

blacken lead acurate paper Correct answer

rekindle a glowing splint

burn a sqeakly pop

Answer Details

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

Acids, Bases And Salts

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Question 10 Report

20 cm3 of 1 M H\(_2\)SO\(_4\) is mixed 20 cm\(^3\) of 1 M NaOH. The resulting solution is?

acidic with a molarity of 0.50 M H₂SO₄ Correct answer

acidic with a molarity of 0.25 H₂SO₄

neutral

alkaline with a molarity of 0.25 M NaOH

alkaline with a molarity of 0.50 M NaOH

Answer Details

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

Acids, Bases And Salts (Ghana Only)

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Question 11 Report

Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst?

Ethyl ethanoate Correct answer

Methyl ethanoate

Ethyl methyl ketone

Butanol

None

Answer Details

Read lesson note on Organic Compounds (JAMB)

Organic Compounds

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Question 12 Report

When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?

substitution

addition Correct answer

polymerization

hydrolysis

reduction

Answer Details

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

Chemical Bonds (Nigeria Only)

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Question 13 Report

Which of the following derivatives of nitrogen affords an aqueous solution having a pH of less that 7?

N₂O

NO₂ Correct answer

NaNO₃

NH₃

Answer Details

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

Acids, Bases And Salts

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Question 14 Report

When copper (ii) sulphate solution is treated with excess ammonium hydroxide, a precipitate is first formed, and then this dissolves to give a deep blue solution. This deep blue solution is a

Cu(OH)₂

CuSo₄.5H₂O

(NH₄)₂SO₄

Cu(NH₃)₄(OH)₂

CuSO₄.(NH₄)₂SO₄.2H₂O Correct answer

Answer Details

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

Acids, Bases And Salts

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Question 15 Report

Which ONE of the following statements is true?

All alkali metals salts dissolves with dissociation in water Correct answer

Most ionic substances are easily vaporized

Ionic substances exist only as liquid

Non-ionic substances are good electrolytes

Nitrogen exists in a trivalent state in ammonium salts

Answer Details

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

Acids, Bases And Salts

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Question 16 Report

Hardening of an oil may be achieved by?

boiling the oil with water

boiling the oil with a catalyst

treating the oil with sodium hydroxide

treating the oil with hydrogen and catalyst Correct answer

distilling oil under reduced pressure

Answer Details

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

Acids, Bases And Salts

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Question 17 Report

10cm³ of CO is mixed and sparked with 100cm³ of air containing 21% O₂. If all the volumes measured at S.T.P. the volume of resulting gases would be?

90cm³

100cm³

105cm³ Correct answer

110cm³

115cm³

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 18 Report

In the above experiment X is

pure nitrogen

a mixture of nitrogen and oxygen

a mixture of nitrogen and carbondioxide

a mixture of oxygen and inert gases

a mixture of nitrogen and inert gases 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)

Kinetic Theory Of Matter And Gas Laws

Separation Of Mixtures And Purification Of Chemical Substances

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Question 19 Report

If one of the following oxides is heated with hydrogen or carbon using a bunsen burner, it is not reduced to the metal. Which one is it?

Lead oxide

Magnesium oxide Correct answer

Copper oxide

Tin oxide

Iron oxide

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 20 Report

Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?

Electrons flow towards the zinc rod Correct answer

The zinc rod dissolves

The temperature of the soil changes

The blue colour of the solution gradually disappears

Copper metal is deposited

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Question 21 Report

Given the mean atomic mass of chlorine prepared in the laboratory to be 35.5 and assuming that chlorine contains two isotopes of mass number 35 nad 37, what is the percentage composition of the isotope of mass number 35?

75 Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 22 Report

Detergents are more advantageous than soaps in hard water districts because

on treatment with hard water they either form soluble calcium salts or do not react with calcium ion Correct answer

on treatment with hard water they form soluble calcium salts

on treatment with hard water they form sodium salts

on treatment with hard water they are converted into soaps

on treatment with hard water they form more lather than soaps does

Answer Details

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

Acids, Bases And Salts (Ghana Only)

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Question 23 Report

Hardening of an oil may achieved by?

boiling the oil with water

boiling the oil with a catalyst

treating the oil with sodium hydroxide

treating the oil with hydrogen and catalyst Correct answer

distilling oil under reduced pressure

Answer Details

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

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

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Periodic Chemistry (Ghana Only)

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Question 24 Report

Which of the following compounds will take up the molecules of bromine?

ll Correct answer

lll

l and ll

l and lll

Answer Details

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

Acids, Bases And Salts

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Question 25 Report

In which of the following is the oxidation state of oxygen different from its value in water?

OH^-

H₃O⁺

O^-

H₂O₂ Correct answer

SO₂

Answer Details

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

Read lesson note on Oxidation And Reduction (JAMB)

Chemical Bonds (Ghana Only)

Oxidation And Reduction

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Question 26 Report

On heating, under suitable conditions, 1 litres of monoatomic gas,X, combines with 1¹/₂ litres of an oxide, What is the formula of the oxide.

XO₃

X₂O₃ Correct answer

X₃O₂

XO₂

None of the above

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 27 Report

The alloy duralumin is used for the building of aeroplanes because it?

asborbs heat readily from sure thereby preventing the inside of the plane from getting cold at high attitudes

reflects sunlight readily, thereby keeping the inside of the plane cool

is extremely durable and possesses reflective ability

is easily the lightest building material

possesses both strenght and lightness Correct answer

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 28 Report

A solution X on mixing with AgNO₃ solution, gives a white precipitate solution in NH₃. A Solution Y, when added to X, also gives a white precipiate which is soluble on boiling. Solution Y contains?

Ag⁺ion

Pb²⁺ion Correct answer

Pb⁴⁺ion

Zn²⁺ion

Al³⁺ion

Answer Details

Read lesson note on Solubility (JAMB)

Solubility

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Question 29 Report

Which of the following tests would confirm-unequivocally that a solution X contain the sulphate ion if it gives with

silver nitrates solution, a white precipates insoluble in dilute HNO₃

barium chloride solution, a white precipitate insoluble in dilute H₂SO₄

barium chloride solution, a white precipitate insoluble in dilute HCl Correct answer

barium chloride solution a white precipitate soluble in dilute ammonia

barium chloride solution a white precipitate insoluble in dilute HCl

Answer Details

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

Acids, Bases And Salts

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Question 30 Report

In an attempt to remove sugar from a breaker containing a quantity of sand and sugar, 2 M ammonium chloride solution was accidentally added instead of water. Which of the following method could be used to remove the ammonium chloride from the mixture?

Fractional distillation

crystallization

Filtration followed by evaporation

Evaporation followed by sublimation Correct answer

Filtration followed by sublimation

Answer Details

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Question 31 Report

Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?

When exposed to air, it slowy changes to liquid Correct answer

its solution in water conducts electricity

Its solution in water, on evaporationm gives a white solid

Its solution in water liberates hydroge when in contact with aluminium metal

Its oxide, when stronlgy heated, regenerates the elements X

Answer Details

Read lesson note on Electrolysis (JAMB)

Read lesson note on Chemical Combination (JAMB)

Electrolysis

Chemical Combination

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Question 32 Report

Chlorine, bromine and iodine resemble each other in that all?

dissolve in alkalis Correct answer

react violently with hydrogen without heating

displace each other from solutions of their salts

are gases

are liquids

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 33 Report

How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm³ of 6M HCl?

(Mg=24, H=1, Cl=35.5)

1.2 g

0.7 g

0.5 g Correct answer

0.3 g

0.12 g

Answer Details

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

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Acids, Bases And Salts (Nigeria Only)

Stoichiometry And Chemical Reactions

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Question 34 Report

Which of the following silver halides is readily soluble in ammonium hydroxide?

Agl

AgBr

AgCl Correct answer

AgF

None of the above

Answer Details

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

Acids, Bases And Salts (Ghana Only)

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Question 35 Report

Cellulose and starches can be classified as one of the following?

sugars

sucrose

hydrocarbons

carbohydrates Correct answer

isomers

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 36 Report

The boiling point of water is higher than that of methanol because?

water is oxide while methanol is an alcohol

inter molecular forces in water are stronger than those in methanol Correct answer

water is an inorganic compound while methanol is organic

water is an ionic compound while methanol is a covalent compound

water is more reactive than methanol

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 37 Report

Which of the following statement is false?

Acids react with some metals, liberating hydrogen

Acids react with carbonates, liberating carbondioxide

Acids conduct electricity and are decomposed by the current, liberating hydrogen at the anode Correct answer

Acids have a sour taste

Acids change the colour of indicators

Answer Details

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

Acids, Bases And Salts

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Question 38 Report

Which of the following is the correct order in the above diagram increasing boiling point, of the isomeric \(C_{5}H_{12}\) compounds?

D Correct answer

Answer Details

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

Read lesson note on Oxidation And Reduction (JAMB)

Kinetic Theory Of Matter And Gas Laws

Oxidation And Reduction

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Question 39 Report

The best way of collecting chlorine is?

by downward displacement of air Correct answer

by upward displacement of air

over water

under water

over mercury

Answer Details

Read lesson note on Air (JAMB)

Air

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Question 40 Report

Under high pressure, real gases do not obey gas laws because their molecules?

have become more energetic

have become less energetic Correct answer

have become smaller in size

decompose into atoms

start repelling each other

Answer Details

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Question 41 Report

Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes are observed?

The bulb lights and copper is deposited at both electrodes

the bulb lights and copper is deposited at the anode and disappears from the cathode

the bulb lights and copper is deposited at the cathode and oxygen liberated at the anode

the bulb lights and copper is deposited at the cathode and disappears from the anode Correct answer

the bulb lights but no additional changes are observed

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 42 Report

A sample of an oxide of mercury weighed 1.00g. When this was heated, oxygen was given off, and 1.00g of mercury metal only was left. What is the formula of the oxide?

Hg₂O

HgO₂

Hg 2 O 3

HgO

None of the above Correct answer

Answer Details

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 43 Report

The following graph demonstrates the rate of reaction between calcium carbonate (marble)and dilute hydrochloric acid. The graph shows that the rate of reaction is initially greatest when

the initial slope of the curve is steepest and this occur when small pieces of marble are used and is due to a small surface area of reactant

the occur when large pieces of marble are used and is due to a small surface area of reactant

the initial slope of the curve is steepest and this occurs when small pieces of marble are used and is due to a large surface area of reactant Correct answer

the initial slope of the curve is steepest and this occur when large surface area of reactant

the initial slope of the curve is least steep and this occur when small pieces of marble are used and is due to the increased surface area of the reactant

Answer Details

Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Question 44 Report

The IUPAC name for the compound is

2,3-dimethylpent-2,3-ene

2, 3- dimethylpent-2-ene Correct answer

3, 4-dimethylpent-3-ene

3,4-dimethylpentene

3,4-dimethlhept-2-ene

Answer Details

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 45 Report

A mixture of ethanol, sodium dichromate, and water is allowed to drop gradually into a boiling solution containing one part concentrated H₂SO
₄ and the liberate gas is collected by cooling it with ice water to give a liquid. This liquid is?

ethanoic acid Correct answer

acetaldehyde

ethyl acetate

methanol

ethylene

Answer Details

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Question 46 Report

Which of the following reactions is correct as as written?

FeCl₂ + 3NH₄OH → Fe(OH)₃ + 3NH₄Cl

Pb₂O₃ + 4HCl → PbCl₂ + 2H₂O

PbNO₃ + H₂S → PbS + 2HNO₃