JAMB UTME - Chemistry - 1981

Wo Idahun

Ibeere 5 Ìròyìn

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 Ìdáhùn tó tọ́

They conduct electricity

Awọn alaye Idahun

Wo Idahun

Ibeere 6 Ìròyìn

An example of a strong electrolyte is?

ethyl acetate

ethanol

glucose

sodium formate Ìdáhùn tó tọ́

formic acid

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Electrolysis

Wo Idahun

Ibeere 7 Ìròyìn

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 Ìdáhùn tó tọ́

Nothing happens

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Electrolysis

Wo Idahun

Ibeere 8 Ìròyìn

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 Ìdáhùn tó tọ́

a reducing agent

a hydrolysing agent

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Ka ìwé ẹ̀kọ́ nípa Oxidation And Reduction (JAMB)

Acids, Bases And Salts

Oxidation And Reduction

Wo Idahun

Ibeere 9 Ìròyìn

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 Ìdáhùn tó tọ́

absorbs water from the air and dissolves in it

gives out its water of crystallization on heating

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 10 Ìròyìn

Which of the following is NOT a true statement of the kinetic Theory of Gases?

The molecules move at random

The size of molecules is negligble as compared with the volume of gas

The molecular collisions are perfectly elastic

Every molecule has the same kinetic energy at a particular temperature Ìdáhùn tó tọ́

The average kinetic energy is proportional to the absolute temperature of the gas

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 11 Ìròyìn

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

CaO Ìdáhùn tó tọ́

CaCI₂

Conc. H₂SO₄

P₂O₅

H₃PO₄

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Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 12 Ìròyìn

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 Ìdáhùn tó tọ́

Zinc

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Metals And Their Compounds (JAMB)

Ka ìwé ẹ̀kọ́ nípa Non-metals And Their Compounds (JAMB)

Metals And Their Compounds

Non-metals And Their Compounds

Wo Idahun

Ibeere 13 Ìròyìn

A polymerization reaction is one in which?

small molecules form giant molecules Ìdáhùn tó tọ́

atoms form molecules

giant molecules form small molecules

molecules form volatile compounds

a molecule rearranges itself

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

Wo Idahun

Ibeere 14 Ìròyìn

In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?

CO₂ + C → 2CO

2Fe₂O₃ + 3C → 4Fe + 3CO₂ Ìdáhùn tó tọ́

Fe₂O₃ + 3C → 2Fe + 3CO₂

CaCO₃ → CaO + CO₂

CaO + SiO₂ → CaSiO₃

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Combination (JAMB)

Chemical Combination

Wo Idahun

Ibeere 15 Ìròyìn

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 Ìdáhùn tó tọ́

576,000

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Electrolysis

Wo Idahun

Ibeere 16 Ìròyìn

In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?

One atom of hydrogen reacts with two atoms of oxygen to give one molecule of water

Two atoms of hydrogen react with two atoms of oxygen to give two molecules of water

One molecule of oxygen reacts with one molecule of hydrogen to give two molecules of water

One molecule of hydrogen reaccts with two molecules of oxygen to give three molecules of water

One molecule of oxygen reacts with two molecules of hydrogen to give two molecules of water Ìdáhùn tó tọ́

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Ka ìwé ẹ̀kọ́ nípa Chemical Combination (JAMB)

Chemical Combination

Wo Idahun

Ibeere 17 Ìròyìn

Allotropes are elements having?

different physical but the same chemical properties Ìdáhùn tó tọ́

different chemical but the same physical properties

the same chemical and physical properties

different atomic structure

the same position in the periodic table

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Equilibria (JAMB)

Chemical Equilibria

Wo Idahun

Ibeere 18 Ìròyìn

The oxidation number of manganese in KMnO₄ is?

+7 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Oxidation And Reduction (JAMB)

Oxidation And Reduction

Wo Idahun

Ibeere 19 Ìròyìn

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 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 20 Ìròyìn

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 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Combination (JAMB)

Chemical Combination

Wo Idahun

Ibeere 21 Ìròyìn

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

saturated

supersaturated

unsaturated Ìdáhùn tó tọ́

a solid

protonated

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Electrolysis

Wo Idahun

Ibeere 22 Ìròyìn

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 Ìdáhùn tó tọ́

Na₂SO₄ + SO₃ + S + H₂O

Na₂SO₄ + SO₂ + H₂O only

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 23 Ìròyìn

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 Ìdáhùn tó tọ́

31.7 cm³

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 24 Ìròyìn

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 Ìdáhùn tó tọ́

dative covalent

metallic

none of the above

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 25 Ìròyìn

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 Ìdáhùn tó tọ́

1s² 2s²2p⁶ 3s^°

1s² 2s²2p⁶ 4s¹

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 26 Ìròyìn

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 Ìdáhùn tó tọ́

3.00

3.66

4.00

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Wo Idahun

Ibeere 27 Ìròyìn

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 Ìdáhùn tó tọ́

sodium nitrate is highly soluble in water

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Energy Changes (JAMB)

Energy Changes

Wo Idahun

Ibeere 28 Ìròyìn

Which of the following can have an isomer?

C₂H₄

C₄H₁₀ Ìdáhùn tó tọ́

C₃H₈

C₂H₆

C₆H₆

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 29 Ìròyìn

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 Ìdáhùn tó tọ́

calcium hydroxide

magnesium sulphate

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Solubility Of Substances (Ghana Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Water (JAMB)

Solubility Of Substances (Ghana Only)

Water

Wo Idahun

Ibeere 30 Ìròyìn

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

209

105

82 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 31 Ìròyìn

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

Ice

Sulphur

Phosphurous

Iodine Ìdáhùn tó tọ́

Potassium iodie

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Ka ìwé ẹ̀kọ́ nípa Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Wo Idahun

Ibeere 32 Ìròyìn

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 Ìdáhùn tó tọ́

500 g

10 g

20 g

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Wo Idahun

Ibeere 33 Ìròyìn

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 Ìdáhùn tó tọ́

both have identical electronic configuration

both react with water vigorously

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Ka ìwé ẹ̀kọ́ nípa Periodic Chemistry (Nigeria Only) (WAEC)

Periodic Chemistry (Nigeria Only)

Wo Idahun

Ibeere 34 Ìròyìn

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 Ìdáhùn tó tọ́

CuO +2HCl \(\to\) Cl₂ + H₂O

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Wo Idahun

Ibeere 35 Ìròyìn

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

the atomic number

the avogadro number Ìdáhùn tó tọ́

the gas constant

the number of neutrons

the number of electrons

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Structure Of The Atom (WAEC)

Structure Of The Atom

Wo Idahun

Ibeere 36 Ìròyìn

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 Ìdáhùn tó tọ́

condensation products of formaldehyde and glycerol

liquids at 20°C

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Chemistry, Industry And The Environment (WAEC)

Ka ìwé ẹ̀kọ́ nípa Metals And Their Compounds (JAMB)

Chemistry Of Carbon Compounds (Nigeria Only)

Chemistry, Industry And The Environment

Metals And Their Compounds

Wo Idahun

Ibeere 37 Ìròyìn

When air is compressed?

its density decreases

it solidifies

its temperature decreases Ìdáhùn tó tọ́

its temperature increases

its temperature remains unchanged

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Ka ìwé ẹ̀kọ́ nípa Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Wo Idahun

Ibeere 38 Ìròyìn

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 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Bonds (Nigeria Only) (WAEC)

Chemical Bonds (Nigeria Only)

Wo Idahun

Ibeere 39 Ìròyìn

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 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 40 Ìròyìn

Oxidation is the process of?

gain of electrons

loss of electrons Ìdáhùn tó tọ́

gain of hydrogen

loss of oxygen

addition of an electropositive element to a substance

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Oxidation And Reduction (JAMB)

Oxidation And Reduction

Wo Idahun

Ibeere 41 Ìròyìn

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 Ìdáhùn tó tọ́

1.0 x 10²²

5.4 x 10²³

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 42 Ìròyìn

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 Ìdáhùn tó tọ́

None of the compounds is gaseous at 20 °C

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 43 Ìròyìn

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

a reducing agent

a nitrating agent

an oxidizing agent Ìdáhùn tó tọ́

a catalytic agent

a neutralizing agent

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Oxidation And Reduction (JAMB)

Oxidation And Reduction

Wo Idahun

Ibeere 44 Ìròyìn

The brown coloration in nitric acid prepared in the laboratory can be removed by?

heating the acid

bubbling air through the acid Ìdáhùn tó tọ́

cooling the acid

adding a decolorizing agent

adding a base

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Wo Idahun

Ibeere 45 Ìròyìn

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 Ìdáhùn tó tọ́

100.1 dm³

3.0 dm³

22.4 dm³

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Wo Idahun

Ibeere 46 Ìròyìn

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 Ìdáhùn tó tọ́

7.00 mole dm³

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Solubility (JAMB)

Solubility

Wo Idahun

Ibeere 47 Ìròyìn

The IUPAC name for

1-methlpentane

3-methylbutane

2-methylbutane Ìdáhùn tó tọ́

1-dimethylpropane

2-methylpentane

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Wo Idahun

Ibeere 48 Ìròyìn

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 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)