JAMB UTME - Chemistry - 1981

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Pergunta 4 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

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Pergunta 5 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 6 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 7 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 8 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

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Pergunta 9 Relatório

An example of a strong electrolyte is?

ethyl acetate

ethanol

glucose

sodium formate

formic acid

Detalhes da Resposta

Read lesson note on Electrolysis (JAMB)

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

Electrolysis

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Pergunta 10 Relatório

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

209

105

Detalhes da Resposta

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Pergunta 11 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

Read lesson note on Chemical Bonds (Nigeria Only) (WAEC)

Chemical Bonds (Nigeria Only)

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Pergunta 12 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 13 Relatório

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

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

Detalhes da Resposta

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

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Pergunta 14 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

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

Acids, Bases And Salts

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Pergunta 15 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)

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Pergunta 16 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

Read lesson note on Solubility (JAMB)

Solubility

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Pergunta 17 Relatório

Which of the following can have an isomer?

C₂H₄

C₄H₁₀

C₃H₈

C₂H₆

C₆H₆

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 18 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

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Pergunta 19 Relatório

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

Detalhes da Resposta

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Pergunta 20 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 21 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 22 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

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pergunta 23 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)

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Pergunta 24 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 25 Relatório

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

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 26 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 27 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 28 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 29 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

Detalhes da Resposta

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Pergunta 30 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 31 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 32 Relatório

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

Detalhes da Resposta

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

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Pergunta 33 Relatório

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

Detalhes da Resposta

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Pergunta 34 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)

Atomic Structure And Bonding

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Pergunta 35 Relatório

For iron to rust, there should be present?

oxygen

moisture

carbondioxide

oxygen and moisture

oxygen, moisture and carbondioxide

Detalhes da Resposta

Read lesson note on Energy And Energy Changes (WAEC)

Energy And Energy Changes

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Pergunta 36 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 37 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 38 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

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Pergunta 39 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

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