JAMB UTME - Chemistry - 1980 | Green Bridge CBT

Pergunta 1 Relatório

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

distilling oil under reduced pressure

Detalhes da Resposta

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

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Chemical Kinetics And Equilibrium Systems (Ghana Only)

Periodic Chemistry (Ghana Only)

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Pergunta 2 Relatório

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

Pb⁴⁺ion

Zn²⁺ion

Al³⁺ion

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Solubility

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Pergunta 3 Relatório

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

Hydrochloric acid and sulphur are produced

sulphur trioxide is the only product

Detalhes da Resposta

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Pergunta 4 Relatório

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

the bulb lights but no additional changes are observed

Detalhes da Resposta

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pergunta 5 Relatório

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

absorbed, +\(\Delta\)G

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Pergunta 6 Relatório

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

Detalhes da Resposta

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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Pergunta 7 Relatório

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

Ethyl ethanoate

Methyl ethanoate

Ethyl methyl ketone

Butanol

None

Detalhes da Resposta

Read lesson note on Organic Compounds (JAMB)

Organic Compounds

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Pergunta 8 Relatório

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

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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Pergunta 9 Relatório

Which ONE of the following statements is true?

All alkali metals salts dissolves with dissociation in water

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

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 10 Relatório

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

OH^-

H₃O⁺

O^-

H₂O₂

SO₂

Detalhes da Resposta

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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Pergunta 11 Relatório

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

110cm³

115cm³

Detalhes da Resposta

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

Kinetic Theory Of Matter And Gas Laws

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Pergunta 12 Relatório

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

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

Detalhes da Resposta

Read lesson note on Electrolysis (JAMB)

Read lesson note on Chemical Combination (JAMB)

Electrolysis

Chemical Combination

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Pergunta 13 Relatório

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

0.3 g

0.12 g

Detalhes da Resposta

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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Pergunta 14 Relatório

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

substitution

addition

polymerization

hydrolysis

reduction

Detalhes da Resposta

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

Chemical Bonds (Nigeria Only)

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Pergunta 15 Relatório

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

Agl

AgBr

AgCl

AgF

None of the above

Detalhes da Resposta

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

Acids, Bases And Salts (Ghana Only)

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Pergunta 16 Relatório

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

distilling oil under reduced pressure

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 17 Relatório

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

The particles collide with each other

Detalhes da Resposta

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

Kinetic Theory Of Matter And Gas Laws

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Pergunta 18 Relatório

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

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

Detalhes da Resposta

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

Kinetic Theory Of Matter And Gas Laws

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Pergunta 19 Relatório

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

sugars

sucrose

hydrocarbons

carbohydrates

isomers

Detalhes da Resposta

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

Kinetic Theory Of Matter And Gas Laws

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Pergunta 20 Relatório

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

rekindle a glowing splint

burn a sqeakly pop

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 21 Relatório

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

Acids have a sour taste

Acids change the colour of indicators

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 22 Relatório

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

lll

l and ll

l and lll

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 23 Relatório

Which of the following statements is true?

Metals conduct electricity while non-metals do not

Metals have high density, non-metals have low density

Metals form basic oxides, non-metals form acidic oxides

In the electro chemical series, metals are above hydrogen while non-metals are below hydrogen

Metals lose elections while non-metals gain electron during normal reactions

Detalhes da Resposta

Read lesson note on Metals And Their Compounds (JAMB)

Read lesson note on Non-metals And Their Compounds (JAMB)

Metals And Their Compounds

Non-metals And Their Compounds

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Pergunta 24 Relatório

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

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 25 Relatório

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

silicon

magnesium

sodium

Detalhes da Resposta

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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Pergunta 26 Relatório

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

acetaldehyde

ethyl acetate

methanol

ethylene

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Pergunta 27 Relatório

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

barium chloride solution a white precipitate soluble in dilute ammonia

barium chloride solution a white precipitate insoluble in dilute HCl

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 28 Relatório

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?

Detalhes da Resposta

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Pergunta 29 Relatório

The best way of collecting chlorine is?

by downward displacement of air

by upward displacement of air

over water

under water

over mercury

Detalhes da Resposta

Read lesson note on Air (JAMB)

Air

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Pergunta 30 Relatório

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

Detalhes da Resposta

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Pergunta 31 Relatório

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

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

Detalhes da Resposta

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

Acids, Bases And Salts (Ghana Only)

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Pergunta 32 Relatório

Which of the following reactions is correct as as written?

FeCl₂ + 3NH₄OH → Fe(OH)₃ + 3NH₄Cl

Pb₂O₃ + 4HCl → PbCl₂ + 2H₂O

PbNO₃ + H₂S → PbS + 2HNO₃

NaOH + H₂SO₄ → NaHSO₄ +H₂O

2NH₄NO₃ → N₂ + 2H₂O

Detalhes da Resposta

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

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Kinetic Theory Of Matter And Gas Laws

Stoichiometry And Chemical Reactions

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Pergunta 33 Relatório

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

X₃O₂

XO₂

None of the above

Detalhes da Resposta

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

Kinetic Theory Of Matter And Gas Laws

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Pergunta 34 Relatório

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

Detalhes da Resposta

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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Pergunta 35 Relatório

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

have become more energetic

have become less energetic

have become smaller in size

decompose into atoms

start repelling each other

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Pergunta 36 Relatório

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

N₂O

NO₂

NaNO₃

NH₃

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 37 Relatório

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

pure water

sodium hypochlorite solution

hydrochloric acid solution

Detalhes da Resposta

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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Pergunta 38 Relatório

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

Copper oxide

Tin oxide

Iron oxide

Detalhes da Resposta

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Pergunta 39 Relatório

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

Filtration followed by sublimation

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Pergunta 40 Relatório

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

0. 11 M

0.20 M

Detalhes da Resposta

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

Acids, Bases And Salts (Ghana Only)

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Pergunta 41 Relatório

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

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

Detalhes da Resposta

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

Acids, Bases And Salts (Ghana Only)

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Pergunta 42 Relatório

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

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

Detalhes da Resposta

Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Pergunta 43 Relatório

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