JAMB UTME - Chemistry - 1980 | Green Bridge CBT

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

Detalles de la respuesta

Read lesson note on Solubility (JAMB)

Solubility

Ver respuesta

Pregunta 4 Informe

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

Detalles de la respuesta

Ver respuesta

Pregunta 5 Informe

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

Detalles de la respuesta

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

Ver respuesta

Pregunta 6 Informe

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

Detalles de la respuesta

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

Kinetic Theory Of Matter And Gas Laws

Ver respuesta

Pregunta 7 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

Ver respuesta

Pregunta 8 Informe

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

Detalles de la respuesta

Ver respuesta

Pregunta 9 Informe

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

sugars

sucrose

hydrocarbons

carbohydrates

isomers

Detalles de la respuesta

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

Kinetic Theory Of Matter And Gas Laws

Ver respuesta

Pregunta 10 Informe

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

N₂O

NO₂

NaNO₃

NH₃

Detalles de la respuesta

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

Acids, Bases And Salts

Ver respuesta

Pregunta 11 Informe

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?

Detalles de la respuesta

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Ver respuesta

Pregunta 12 Informe

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

oxidation

hydrolysis

dissociation

reduction

disproportionation

Detalles de la respuesta

Read lesson note on Electrolysis (JAMB)

Electrolysis

Ver respuesta

Pregunta 13 Informe

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

Detalles de la respuesta

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

Ver respuesta

Pregunta 14 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

Ver respuesta

Pregunta 15 Informe

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

Detalles de la respuesta

Read lesson note on Electrolysis (JAMB)

Electrolysis

Ver respuesta

Pregunta 16 Informe

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

OH^-

H₃O⁺

O^-

H₂O₂

SO₂

Detalles de la respuesta

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

Read lesson note on Oxidation And Reduction (JAMB)

Chemical Bonds (Ghana Only)

Oxidation And Reduction

Ver respuesta

Pregunta 17 Informe

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

alcohols

alkenes

carboxylic acids

esters

alkanes

Detalles de la respuesta

Ver respuesta

Pregunta 18 Informe

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

Detalles de la respuesta

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)

Ver respuesta

Pregunta 19 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

Ver respuesta

Pregunta 20 Informe

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

Detalles de la respuesta

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

Ver respuesta

Pregunta 21 Informe

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

Detalles de la respuesta

Read lesson note on Electrolysis (JAMB)

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

Electrolysis

Acids, Bases And Salts (Ghana Only)

Ver respuesta

Pregunta 22 Informe

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

Detalles de la respuesta

Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

Ver respuesta

Pregunta 23 Informe

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

Detalles de la respuesta

Ver respuesta

Pregunta 24 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

Ver respuesta

Pregunta 25 Informe

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

Detalles de la respuesta

Ver respuesta

Pregunta 26 Informe

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

Detalles de la respuesta

Ver respuesta

Pregunta 27 Informe

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

dissolve in alkalis

react violently with hydrogen without heating

displace each other from solutions of their salts

are gases

are liquids

Detalles de la respuesta

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

Ver respuesta

Pregunta 28 Informe

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

lll

l and ll

l and lll

Detalles de la respuesta

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

Acids, Bases And Salts

Ver respuesta

Pregunta 29 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

Ver respuesta

Pregunta 30 Informe

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

Detalles de la respuesta

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

Ver respuesta

Pregunta 31 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts (Ghana Only)

Ver respuesta

Pregunta 32 Informe

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

Detalles de la respuesta

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

Ver respuesta

Pregunta 33 Informe

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

Detalles de la respuesta

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

Ver respuesta

Pregunta 34 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

Ver respuesta

Pregunta 35 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts (Ghana Only)

Ver respuesta

Pregunta 36 Informe

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

HgO

None of the above

Detalles de la respuesta

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

Ver respuesta

Pregunta 37 Informe

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

Detalles de la respuesta

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

Kinetic Theory Of Matter And Gas Laws

Ver respuesta

Pregunta 38 Informe

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

Detalles de la respuesta

Read lesson note on Organic Compounds (JAMB)

Organic Compounds

Ver respuesta

Pregunta 39 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts (Ghana Only)

Ver respuesta

Pregunta 40 Informe

The best way of collecting chlorine is?

by downward displacement of air

by upward displacement of air

over water

under water

over mercury

Detalles de la respuesta

Read lesson note on Air (JAMB)

Air

Ver respuesta

Pregunta 41 Informe

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

Detalles de la respuesta

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

Ver respuesta

Pregunta 42 Informe

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

Detalles de la respuesta

Read lesson note on Electrolysis (JAMB)

Read lesson note on Chemical Combination (JAMB)

Electrolysis

Chemical Combination

Ver respuesta

Pregunta 43 Informe