JAMB UTME - Chemistry - 1981

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Frage 5 Bericht

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

209

105

82 Richtige Antwort

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)

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Frage 6 Bericht

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 Richtige Antwort

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

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 7 Bericht

For iron to rust, there should be present?

oxygen

moisture

carbondioxide

oxygen and moisture Richtige Antwort

oxygen, moisture and carbondioxide

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Lies die Unterrichtsnotiz zu Energy And Energy Changes (WAEC)

Energy And Energy Changes

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Frage 8 Bericht

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 Richtige Antwort

3.00

3.66

4.00

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

Lies die Unterrichtsnotiz zu Stoichiometry And Chemical Reactions (WAEC)

Lies die Unterrichtsnotiz zu Acids, Bases And Salts (Ghana Only) (WAEC)

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Frage 9 Bericht

When air is compressed?

its density decreases

it solidifies

its temperature decreases Richtige Antwort

its temperature increases

its temperature remains unchanged

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

Lies die Unterrichtsnotiz zu Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Frage 10 Bericht

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 Richtige Antwort

CuO +2HCl \(\to\) Cl₂ + H₂O

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

Lies die Unterrichtsnotiz zu Stoichiometry And Chemical Reactions (WAEC)

Lies die Unterrichtsnotiz zu Acids, Bases And Salts (Ghana Only) (WAEC)

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Frage 11 Bericht

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 Richtige Antwort

576,000

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Lies die Unterrichtsnotiz zu Electrolysis (JAMB)

Lies die Unterrichtsnotiz zu Stoichiometry And Chemical Reactions (WAEC)

Electrolysis

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Frage 12 Bericht

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

CaO Richtige Antwort

CaCI₂

Conc. H₂SO₄

P₂O₅

H₃PO₄

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Lies die Unterrichtsnotiz zu Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Frage 13 Bericht

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 Richtige Antwort

1.0 x 10²²

5.4 x 10²³

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 14 Bericht

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 Richtige Antwort

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Lies die Unterrichtsnotiz zu Chemical Combination (JAMB)

Chemical Combination

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Frage 15 Bericht

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 Richtige Antwort

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Lies die Unterrichtsnotiz zu Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Frage 16 Bericht

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 Richtige Antwort

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Lies die Unterrichtsnotiz zu Chemical Combination (JAMB)

Chemical Combination

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Frage 17 Bericht

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

C_nH_2n - ₂X

C_nH_2n + ₁X Richtige Antwort

C_nH_2n + ₂X

C_nH_2nX

C_nH_2n - 1

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Lies die Unterrichtsnotiz zu Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

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Frage 18 Bericht

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

hydrogen

carbon monoxide

carbon dioxide Richtige Antwort

sulphur oxide

chlorine

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 19 Bericht

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 Richtige Antwort

absorbs water from the air and dissolves in it

gives out its water of crystallization on heating

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Frage 20 Bericht

The IUPAC name for

1-methlpentane

3-methylbutane

2-methylbutane Richtige Antwort

1-dimethylpropane

2-methylpentane

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Lies die Unterrichtsnotiz zu Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

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Frage 21 Bericht

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 Richtige Antwort

both have identical electronic configuration

both react with water vigorously

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Lies die Unterrichtsnotiz zu Periodic Chemistry (Nigeria Only) (WAEC)

Periodic Chemistry (Nigeria Only)

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Frage 22 Bericht

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

a reducing agent

a nitrating agent

an oxidizing agent Richtige Antwort

a catalytic agent

a neutralizing agent

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Lies die Unterrichtsnotiz zu Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Frage 23 Bericht

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

saturated

supersaturated

unsaturated Richtige Antwort

a solid

protonated

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Lies die Unterrichtsnotiz zu Electrolysis (JAMB)

Electrolysis

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Frage 24 Bericht

A polymerization reaction is one in which?

small molecules form giant molecules Richtige Antwort

atoms form molecules

giant molecules form small molecules

molecules form volatile compounds

a molecule rearranges itself

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Lies die Unterrichtsnotiz zu Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

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Frage 25 Bericht

Oxidation is the process of?

gain of electrons

loss of electrons Richtige Antwort

gain of hydrogen

loss of oxygen

addition of an electropositive element to a substance

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Lies die Unterrichtsnotiz zu Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Frage 26 Bericht

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 Richtige Antwort

calcium hydroxide

magnesium sulphate

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Lies die Unterrichtsnotiz zu Solubility Of Substances (Ghana Only) (WAEC)

Lies die Unterrichtsnotiz zu Water (JAMB)

Solubility Of Substances (Ghana Only)

Water

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Frage 27 Bericht

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 Richtige Antwort

100.1 dm³

3.0 dm³

22.4 dm³

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Lies die Unterrichtsnotiz zu Stoichiometry And Chemical Reactions (WAEC)

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Frage 28 Bericht

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 Richtige Antwort

sodium nitrate is highly soluble in water

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Lies die Unterrichtsnotiz zu Energy Changes (JAMB)

Energy Changes

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Frage 29 Bericht

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 Richtige Antwort

31.7 cm³

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 30 Bericht

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 Richtige Antwort

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)

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Frage 31 Bericht

Methane is member of the homologous series called?

alkenes

alcohols

esters

alkanes Richtige Antwort

alkynes

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Lies die Unterrichtsnotiz zu Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

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Frage 32 Bericht

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 Richtige Antwort

dative covalent

metallic

none of the above

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Frage 33 Bericht

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 Richtige Antwort

Na₂SO₄ + SO₃ + S + H₂O

Na₂SO₄ + SO₂ + H₂O only

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Lies die Unterrichtsnotiz zu Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Frage 34 Bericht

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 Richtige Antwort

None of the compounds is gaseous at 20 °C

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 35 Bericht

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

heating the acid

bubbling air through the acid Richtige Antwort

cooling the acid

adding a decolorizing agent

adding a base

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Frage 36 Bericht

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

the atomic number

the avogadro number Richtige Antwort

the gas constant

the number of neutrons

the number of electrons

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Lies die Unterrichtsnotiz zu Structure Of The Atom (WAEC)

Structure Of The Atom

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Frage 37 Bericht

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 Richtige Antwort

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Lies die Unterrichtsnotiz zu Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Frage 38 Bericht

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

Ice

Sulphur

Phosphurous

Iodine Richtige Antwort

Potassium iodie

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

Lies die Unterrichtsnotiz zu Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

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Frage 39 Bericht

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 Richtige Antwort

Fe₂O₃ + 3C → 2Fe + 3CO₂

CaCO₃ → CaO + CO₂

CaO + SiO₂ → CaSiO₃

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Lies die Unterrichtsnotiz zu Chemical Combination (JAMB)

Chemical Combination

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Frage 40 Bericht

An example of a strong electrolyte is?

ethyl acetate

ethanol

glucose

sodium formate Richtige Antwort

formic acid

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Lies die Unterrichtsnotiz zu Electrolysis (JAMB)

Lies die Unterrichtsnotiz zu Acids, Bases And Salts (Ghana Only) (WAEC)

Electrolysis

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Frage 41 Bericht

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 Richtige Antwort

1s² 2s²2p⁶ 3s^°

1s² 2s²2p⁶ 4s¹

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)