JAMB UTME - Chemistry - 1981

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Pergunta 2 Relatório

What mass of sodium carbonate solution is in 500 cm³ of 0.1 molar sodium carbonate solution?

(Na = 23, C = 12, O = 16)

10.6 g

5.3 g

500 g

10 g

20 g

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Pergunta 3 Relatório

An element X has 127 neutrons and 82 electrons.
Its atomic number is?

209

105

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Pergunta 4 Relatório

Which of the following can have an isomer?

C₂H₄

C₄H₁₀

C₃H₈

C₂H₆

C₆H₆

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 5 Relatório

The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?

Na₂SO₄ + SO₂ + O₂ + H₂O

Na₂SO₃ + SO₃ + O₂ + H₂O

Na₂SO₄ + SO₂ + S + H₂O

Na₂SO₄ + SO₃ + S + H₂O

Na₂SO₄ + SO₂ + H₂O only

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 6 Relatório

Which of the following statements is NOT true of electrovalent compounds?

They are solids

They do not vaporized easily

They usually dissolve in water

The elements forming the compounds normally have their valency electrons in a shared state

They conduct electricity

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Pergunta 7 Relatório

When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?

hydrogen

carbon monoxide

carbon dioxide

sulphur oxide

chlorine

Detalhes da Resposta

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

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Pergunta 8 Relatório

For iron to rust, there should be present?

oxygen

moisture

carbondioxide

oxygen and moisture

oxygen, moisture and carbondioxide

Detalhes da Resposta

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Energy And Energy Changes

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Pergunta 9 Relatório

When air is compressed?

its density decreases

it solidifies

its temperature decreases

its temperature increases

its temperature remains unchanged

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)

Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 10 Relatório

The oxidation number of manganese in KMnO₄ is?

Detalhes da Resposta

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Pergunta 11 Relatório

If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?

a drying agent

an oxidizing agent

a dehydrated agent

a reducing agent

a hydrolysing agent

Detalhes da Resposta

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

Read lesson note on Oxidation And Reduction (JAMB)

Acids, Bases And Salts

Oxidation And Reduction

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Pergunta 12 Relatório

Methane is member of the homologous series called?

alkenes

alcohols

esters

alkanes

alkynes

Detalhes da Resposta

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

Periodic Chemistry (Ghana Only)

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Pergunta 13 Relatório

The mass number of an atom is?

the number of electrons in the atom

the number of protons in the nucleus of the atom

the number of neutrons in the nucleus of the atom

the sum of numbers of electrons and protons inthe atom

the sum of numbers of proton and neutrons in the nucleus of the atom

Detalhes da Resposta

Read lesson note on Atomic Structure And Bonding (JAMB)

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Pergunta 14 Relatório

What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?

All the nitrate will decompose to their respective metals

The nitrates of calcium and potassium will decomposes to their nitrites

Only copper nitrate decomposes to the metal

Only the nitrates of zinc and copper will decompose to their oxides

The nitrates of calcium, zinc and copper decompose to their oxides

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 15 Relatório

Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)

1s² 2s²2p⁶ 3s²

1s² 2s²2p⁶ 3s² 3p1s² 2s²2p⁶ 3s¹

1s² 2s²2p⁶ 3s¹

1s² 2s²2p⁶ 3s^°

1s² 2s²2p⁶ 4s¹

Detalhes da Resposta

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Pergunta 16 Relatório

When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?

both gases change the colour of the solution from yellow to colourless

both gases causes sulphur to be deposited

only hydrogen sulphide decolourizes the solution

only sulphur dioxide deposits sulphur

only hydrogen sulphide deposits sulphur

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 17 Relatório

4g each of aluminium foil and aluminium powder were introduced respectively into flasks P and Q.
Flask P was treated with warm bench sodium hydroxide and all the aluminium dissolved in one hour. Flask Q was treated with cold sodium hydroxide and all the aluminium dissolved in 10 minutes. What was responsible for Q reacting faster than P?

There were more aluminium atoms in Q than P

The heat given off in retarded the reaction

Q generated more pressure than P during the reaction

P generated more pressure than Q

Q has a greater surface area for the reaction than P

Detalhes da Resposta

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Chemical Combination

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Pergunta 18 Relatório

Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series?

Copper

Iron

Lead

Potassium

Zinc

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 19 Relatório

Fats and oils are?

addition products of long chain fatty acids and alkali

addition products of long-chain fattyy acids and glycerol

condensation products of long-chain fatty acids and glycerol

condensation products of formaldehyde and glycerol

liquids at 20°C

Detalhes da Resposta

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

Read lesson note on Chemistry, Industry And The Environment (WAEC)

Read lesson note on Metals And Their Compounds (JAMB)

Chemistry Of Carbon Compounds (Nigeria Only)

Chemistry, Industry And The Environment

Metals And Their Compounds

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Pergunta 20 Relatório

the number of atoms in one mole of a substance is equal to?

the atomic number

the avogadro number

the gas constant

the number of neutrons

the number of electrons

Detalhes da Resposta

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Structure Of The Atom

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Pergunta 21 Relatório

The scale formation in a kinetic used for boiling water is caused by the presence in water of?

calcium sulphate

calcium carbonate

calcium hydrogen carbonate

calcium hydroxide

magnesium sulphate

Detalhes da Resposta

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

Read lesson note on Water (JAMB)

Solubility Of Substances (Ghana Only)

Water

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Pergunta 22 Relatório

In the preparation of ammonia, which of the following is used as the drying agent?

CaO

CaCI₂

Conc. H₂SO₄

P₂O₅

H₃PO₄

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 23 Relatório

28.8 cm³ of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?

17.4 cm³

14.7 cm³

27.3 cm³

31.7 cm³

Detalhes da Resposta

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

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Pergunta 24 Relatório

Which of the following compounds and elements would sublime on exposure to the atmosphere?

Ice

Sulphur

Phosphurous

Iodine

Potassium iodie

Detalhes da Resposta

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

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

Non-metals And Their Compounds

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Pergunta 25 Relatório

When sodium nitrate dissolves in water, ∆H is positive. This means that?

the reaction is catalysed

the reaction is complete

the reaction is exothermic

the reaction is endthermic

sodium nitrate is highly soluble in water

Detalhes da Resposta

Read lesson note on Energy Changes (JAMB)

Energy Changes

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Pergunta 26 Relatório

Pure sulphuric acid is a liquid of 1:84 density. What volume of it would be required to prepare 250 cm³ of 2.0 M solution?

(H = 1, S = 32, O = 16)

2.00

2.66

3.00

3.66

4.00

Detalhes da Resposta

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

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

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

Acids, Bases And Salts (Ghana Only)

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Pergunta 27 Relatório

When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is?

methane

hydrogen chloride

hydrogen

nitrogen

carbondioxide

Detalhes da Resposta

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Pergunta 28 Relatório

The following compounds are given with their corresponding boiling points.
Compound Boiling Point
i.................................14°C
ii................................24°C
iii................................0°C
iv................................120°C
V.................................-2°C
From the above information, indicate which of the following is correct?

All the compounds are gaseous at 20 °C

One of the compounds is gaseous at 20 °C

Two of the compounds are gaseous at 20 °C

Three of the compounds are gaseous at 20 °C

None of the compounds is gaseous at 20 °C

Detalhes da Resposta

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

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Pergunta 29 Relatório

Which of the following processes takes place during electrolysis?

Positive ions are discharged at the anode bby gaining sufficient electrons to become neutral

Negative ions are dicharged at the anode by gaining suficient electrons to become neutral

Positive ions are discharged at the anode by losing sufficient electrons to become neutral

Negative ions are discharge at the anode by losing sufficient electrons to become neutral

Nothing happens

Detalhes da Resposta

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Electrolysis

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Pergunta 30 Relatório

If an organic compound decolorizes bromine water then the compound is?

saturated

supersaturated

unsaturated

a solid

protonated

Detalhes da Resposta

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Electrolysis

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Pergunta 31 Relatório

The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be?

ionic

covalent

dative covalent

metallic

none of the above

Detalhes da Resposta

Read lesson note on Atomic Structure And Bonding (JAMB)

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Pergunta 32 Relatório

If one mole of aluminium contains 6 x 10²³ atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)

1.0 x 10²¹

6.6 x 10²¹

2.0 x 10²²

1.0 x 10²²

5.4 x 10²³

Detalhes da Resposta

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

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Pergunta 33 Relatório

A polymerization reaction is one in which?

small molecules form giant molecules

atoms form molecules

giant molecules form small molecules

molecules form volatile compounds

a molecule rearranges itself

Detalhes da Resposta

Read lesson note on Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

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Pergunta 34 Relatório

Sodium and potassium belong to the same group of the Periodic Table. This is because?

both are metals

both are soft and lighter than water

both form cations by losing electrons

both have identical electronic configuration

both react with water vigorously

Detalhes da Resposta

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

Periodic Chemistry (Nigeria Only)

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Pergunta 35 Relatório

Which of the following represents a precipitation reaction?

H₂SO₄ + NaCl \(\to\) NaHSO₄ + HCl

Fe +H₂SO₄ \(\to\) FeSO₄ + H₂

4HCl + MnO₂ \(\to\) MnCl₂ + 2H₂O + Cl₂

Na₂SO₄ + pb(NO₃) \(\to\) PbSO₄ + 2NaNO

CuO +2HCl \(\to\) Cl₂ + H₂O

Detalhes da Resposta

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

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

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

Acids, Bases And Salts (Ghana Only)

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Pergunta 36 Relatório

Na₂CO₃ + 2HCI → 2NaCI + H₂O + CO₂. Using the above equation, what volume of carbondioxide, measured at s.t.p is liberated when 53g of sodium carbonate is dissolved in hydrochloric acid?
(1 mole of gas occupies 22.4 dm³ at s.t.p)
(Na = 23, C = 12, O = 16)

44.8 dm³

11.2 dm³

100.1 dm³

3.0 dm³

22.4 dm³

Detalhes da Resposta

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Pergunta 37 Relatório

Oxidation is the process of?

gain of electrons

loss of electrons

gain of hydrogen

loss of oxygen

addition of an electropositive element to a substance

Detalhes da Resposta

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Oxidation And Reduction

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Pergunta 38 Relatório

The IUPAC name for

1-methlpentane

3-methylbutane

2-methylbutane

1-dimethylpropane

2-methylpentane

Detalhes da Resposta

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 39 Relatório

Which of the following statements about phosphorus is NOT correct?

Phosphorus is a solid mineral

Phosphorus is obtained by oxidation reaction of phosphate

Phosphorus exists in two allotropic forms

Both forms of phosphorus are interconvertible

Yellow phosporus ignites when rubbed on a rough surface

Detalhes da Resposta

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Chemical Bonds (Nigeria Only)

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Pergunta 40 Relatório

In the reaction
C + 2HNO₃ → CO₂ + NO₂ + NO + H₂O nitric acid is acting as?

a reducing agent

a nitrating agent

an oxidizing agent

a catalytic agent

a neutralizing agent

Detalhes da Resposta

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Pergunta 41 Relatório

5cm³ of a saturated solution of sodium chloride at 30°C gave, on careful evaporation, 1.95g of solid salt. The solubility of sodium chloride at 30°C?

(Na = 23, Cl = 35.5)

5.00 mole dm³

5.67 mole dm³

6.00 mole dm³

6.67 mole dm³

7.00 mole dm³

Detalhes da Resposta

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Solubility

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Pergunta 42 Relatório

An efflorescent compound is a substance that?

absorbs water froom the air without dissolving in it

is capable of giving off coloured luminosity

gives out water to the atmosphere

absorbs water from the air and dissolves in it

gives out its water of crystallization on heating

Detalhes da Resposta

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

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Pergunta 43 Relatório

If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (ll) chloride is?

48,000

96,000

192,000

384,000

576,000

Detalhes da Resposta

Read lesson note on Electrolysis (JAMB)

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Electrolysis