JAMB UTME - Chemistry - 1981

Tazama Jibu

Swali 5 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Structure Of The Atom (WAEC)

Structure Of The Atom

Tazama Jibu

Swali 6 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 7 Ripoti

For iron to rust, there should be present?

oxygen

moisture

carbondioxide

oxygen and moisture

oxygen, moisture and carbondioxide

Maelezo ya Majibu

Soma maelezo ya somo kwenye Energy And Energy Changes (WAEC)

Energy And Energy Changes

Tazama Jibu

Swali 8 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Tazama Jibu

Swali 9 Ripoti

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

Fe₂O₃ + 3C → 2Fe + 3CO₂

CaCO₃ → CaO + CO₂

CaO + SiO₂ → CaSiO₃

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Chemical Combination

Tazama Jibu

Swali 10 Ripoti

An example of a strong electrolyte is?

ethyl acetate

ethanol

glucose

sodium formate

formic acid

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Electrolysis

Tazama Jibu

Swali 11 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Solubility (JAMB)

Solubility

Tazama Jibu

Swali 12 Ripoti

When air is compressed?

its density decreases

it solidifies

its temperature decreases

its temperature increases

its temperature remains unchanged

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 13 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Chemical Combination

Tazama Jibu

Swali 14 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 15 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Oxidation And Reduction

Tazama Jibu

Swali 16 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 17 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Oxidation And Reduction

Tazama Jibu

Swali 18 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 19 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Metals And Their Compounds (JAMB)

Soma maelezo ya somo kwenye Non-metals And Their Compounds (JAMB)

Metals And Their Compounds

Non-metals And Their Compounds

Tazama Jibu

Swali 20 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 21 Ripoti

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

heating the acid

bubbling air through the acid

cooling the acid

adding a decolorizing agent

adding a base

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Tazama Jibu

Swali 22 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Bonds (Nigeria Only) (WAEC)

Chemical Bonds (Nigeria Only)

Tazama Jibu

Swali 23 Ripoti

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

hydrogen

carbon monoxide

carbon dioxide

sulphur oxide

chlorine

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 24 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Energy Changes (JAMB)

Energy Changes

Tazama Jibu

Swali 25 Ripoti

The oxidation number of manganese in KMnO₄ is?

Maelezo ya Majibu

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Oxidation And Reduction

Tazama Jibu

Swali 26 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 27 Ripoti

Which of the following can have an isomer?

C₂H₄

C₄H₁₀

C₃H₈

C₂H₆

C₆H₆

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 28 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Soma maelezo ya somo kwenye Chemistry, Industry And The Environment (WAEC)

Soma maelezo ya somo kwenye Metals And Their Compounds (JAMB)

Chemistry Of Carbon Compounds (Nigeria Only)

Chemistry, Industry And The Environment

Metals And Their Compounds

Tazama Jibu

Swali 29 Ripoti

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

209

105

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 30 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 31 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 32 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Solubility Of Substances (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Water (JAMB)

Solubility Of Substances (Ghana Only)

Water

Tazama Jibu

Swali 33 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Periodic Chemistry (Nigeria Only) (WAEC)

Periodic Chemistry (Nigeria Only)

Tazama Jibu

Swali 34 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 35 Ripoti

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

saturated

supersaturated

unsaturated

a solid

protonated

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 36 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Tazama Jibu

Swali 37 Ripoti

The IUPAC name for

1-methlpentane

3-methylbutane

2-methylbutane

1-dimethylpropane

2-methylpentane

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 38 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 39 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

Tazama Jibu

Swali 40 Ripoti

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

Maelezo ya Majibu

Tazama Jibu

Swali 41 Ripoti

The general formula of an alkyl halide (which represent the halide) is?

C_nH_2n - ₂X

C_nH_2n + ₁X

C_nH_2n + ₂X

C_nH_2nX

C_nH_2n - 1

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 42 Ripoti

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

Ice

Sulphur

Phosphurous

Iodine

Potassium iodie

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Soma maelezo ya somo kwenye Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Tazama Jibu

Swali 43 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Tazama Jibu

Swali 44 Ripoti

Methane is member of the homologous series called?

alkenes

alcohols

esters

alkanes

alkynes

Maelezo ya Majibu

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

Tazama Jibu

Swali 45 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Tazama Jibu

Swali 46 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 47 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Electrolysis