JAMB UTME - Chemistry - 1981

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Vraag 4 Verslag

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 Juist antwoord

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Vraag 5 Verslag

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 Juist antwoord

500 g

10 g

20 g

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Vraag 6 Verslag

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 Juist antwoord

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Vraag 7 Verslag

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 Juist antwoord

7.00 mole dm³

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Solubility

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Vraag 8 Verslag

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 Juist antwoord

31.7 cm³

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Vraag 9 Verslag

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

CaO Juist antwoord

CaCI₂

Conc. H₂SO₄

P₂O₅

H₃PO₄

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Acids, Bases And Salts

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Vraag 10 Verslag

The IUPAC name for

1-methlpentane

3-methylbutane

2-methylbutane Juist antwoord

1-dimethylpropane

2-methylpentane

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Chemistry Of Carbon Compounds (Nigeria Only)

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Vraag 11 Verslag

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 Juist antwoord

Fe₂O₃ + 3C → 2Fe + 3CO₂

CaCO₃ → CaO + CO₂

CaO + SiO₂ → CaSiO₃

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Chemical Combination

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Vraag 12 Verslag

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 Juist antwoord

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Vraag 13 Verslag

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

C_nH_2n - ₂X

C_nH_2n + ₁X Juist antwoord

C_nH_2n + ₂X

C_nH_2nX

C_nH_2n - 1

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Chemistry Of Carbon Compounds (Nigeria Only)

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Vraag 14 Verslag

Allotropes are elements having?

different physical but the same chemical properties Juist antwoord

different chemical but the same physical properties

the same chemical and physical properties

different atomic structure

the same position in the periodic table

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Chemical Equilibria

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Vraag 15 Verslag

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 Juist antwoord

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Vraag 16 Verslag

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

Ice

Sulphur

Phosphurous

Iodine Juist antwoord

Potassium iodie

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Non-metals And Their Compounds

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Vraag 17 Verslag

When air is compressed?

its density decreases

it solidifies

its temperature decreases Juist antwoord

its temperature increases

its temperature remains unchanged

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Separation Of Mixtures And Purification Of Chemical Substances

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Vraag 18 Verslag

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

209

105

82 Juist antwoord

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Vraag 19 Verslag

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 Juist antwoord

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

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Vraag 20 Verslag

A polymerization reaction is one in which?

small molecules form giant molecules Juist antwoord

atoms form molecules

giant molecules form small molecules

molecules form volatile compounds

a molecule rearranges itself

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Basic Biochemistry And Synthetic Polymers

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Vraag 21 Verslag

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 Juist antwoord

1.0 x 10²²

5.4 x 10²³

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Vraag 22 Verslag

Oxidation is the process of?

gain of electrons

loss of electrons Juist antwoord

gain of hydrogen

loss of oxygen

addition of an electropositive element to a substance

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Oxidation And Reduction

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Vraag 23 Verslag

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 Juist antwoord

calcium hydroxide

magnesium sulphate

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Solubility Of Substances (Ghana Only)

Water

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Vraag 24 Verslag

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 Juist antwoord

3.00

3.66

4.00

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Vraag 25 Verslag

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

the atomic number

the avogadro number Juist antwoord

the gas constant

the number of neutrons

the number of electrons

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Structure Of The Atom

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Vraag 26 Verslag

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 Juist antwoord

None of the compounds is gaseous at 20 °C

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Vraag 27 Verslag

Methane is member of the homologous series called?

alkenes

alcohols

esters

alkanes Juist antwoord

alkynes

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Vraag 28 Verslag

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 Juist antwoord

dative covalent

metallic

none of the above

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Vraag 29 Verslag

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 Juist antwoord

condensation products of formaldehyde and glycerol

liquids at 20°C

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Chemistry Of Carbon Compounds (Nigeria Only)

Chemistry, Industry And The Environment

Metals And Their Compounds

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Vraag 30 Verslag

Which of the following can have an isomer?

C₂H₄

C₄H₁₀ Juist antwoord

C₃H₈

C₂H₆

C₆H₆

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Acids, Bases And Salts

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Vraag 31 Verslag

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

saturated

supersaturated

unsaturated Juist antwoord

a solid

protonated

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Electrolysis

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Vraag 32 Verslag

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 Juist antwoord

absorbs water from the air and dissolves in it

gives out its water of crystallization on heating

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Vraag 33 Verslag

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 Juist antwoord

a reducing agent

a hydrolysing agent

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Acids, Bases And Salts

Oxidation And Reduction

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Vraag 34 Verslag

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 Juist antwoord

576,000

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Electrolysis

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Vraag 35 Verslag

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 Juist antwoord

100.1 dm³

3.0 dm³

22.4 dm³

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Vraag 36 Verslag

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 Juist antwoord

They conduct electricity

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Vraag 37 Verslag

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 Juist antwoord

Zinc

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Metals And Their Compounds

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Vraag 38 Verslag

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 Juist antwoord

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Vraag 39 Verslag

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 Juist antwoord

Nothing happens

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Electrolysis

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Vraag 40 Verslag

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

a reducing agent

a nitrating agent

an oxidizing agent Juist antwoord

a catalytic agent

a neutralizing agent

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Oxidation And Reduction

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Vraag 41 Verslag

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 Juist antwoord

sodium nitrate is highly soluble in water

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Vraag 42 Verslag

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 Juist antwoord

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Vraag 43 Verslag

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

heating the acid

bubbling air through the acid Juist antwoord

cooling the acid

adding a decolorizing agent

adding a base

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Vraag 44 Verslag

For iron to rust, there should be present?

oxygen

moisture

carbondioxide

oxygen and moisture Juist antwoord

oxygen, moisture and carbondioxide

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Energy And Energy Changes

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Vraag 45 Verslag

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 Juist antwoord

CuO +2HCl \(\to\) Cl₂ + H₂O

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Vraag 46 Verslag

The oxidation number of manganese in KMnO₄ is?

+7 Juist antwoord

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Oxidation And Reduction

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Vraag 47 Verslag

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

hydrogen

carbon monoxide

carbon dioxide Juist antwoord

sulphur oxide

chlorine

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Vraag 48 Verslag

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 Juist antwoord

both have identical electronic configuration

both react with water vigorously

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Periodic Chemistry (Nigeria Only)

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Vraag 49 Verslag

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 Juist antwoord

1s² 2s²2p⁶ 3s^°

1s² 2s²2p⁶ 4s¹

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