NECO SSCE - Chemistry - 2008 (Objective)

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Question 3 Report

When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because

sodium hydroxide is a strong alkali

sodium is more reactive than zinc

zinc is more reactive than sodium

zinc hydroxide is amphoteric Correct answer

zinc hydroxide is unstable

Answer Details

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

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Question 4 Report

Pipe-borne water is usually chlorinated in order to

coagulate sediments in the water

improve taste of the water

kill harmful bacteria in the water Correct answer

make it pure

remove the hardness in the water

Answer Details

Read lesson note on Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Read lesson note on Redox Reactions (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Redox Reactions

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Question 5 Report

The action of zinc on an acid produces

chlorine

hydrogen Correct answer

nitrogen

sulphur

water vapour.

Answer Details

Read lesson note on Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

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Question 6 Report

pH is define as

[H+]

–log [H]

–log [H+] Correct answer

log [H]

log [H+]

Answer Details

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

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

Acids, Bases And Salts

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Question 7 Report

A substance is said to be hygroscopic when it

absorbs atmospheric moisture and then goes into solution

absorbs atmospheric moisture but does not go into solution Correct answer

changes colour

is not affected by atmospheric moisture

losses its water of crystallization

Answer Details

Read lesson note on Solubility (JAMB)

Read lesson note on Solubility Of Substances (Ghana Only) (WAEC)

Solubility

Solubility Of Substances (Ghana Only)

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Question 8 Report

An element Z has a combining power of 3. Which of the following formulae is correct of its compound?

ZS₃

ZSO₃

ZS0₄

Z0₃ Correct answer

Z₃Cl₂

Answer Details

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 9 Report

Which of the following is a component of the car exhaust?

Aluminium

Calcium

Iron

Zinc

Lead Correct answer

Answer Details

Read lesson note on Environmental Pollution (JAMB)

Environmental Pollution

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Question 10 Report

The high boiling point of hydrogen fluoride can be explained in terms of?

covalent bonds.

dative bonds.

dipole-dipole bonds

electrovalent (ionic) bonds.

hydrogen bonds. Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 11 Report

In which of these groups will all the substances be insoluble in water?

Na₂CO₃, KNO₃,(NH₄)₂C0₃

NaHCO₃, PbSO₄, CaSO₄

K₂C0₃, CaSO₄, AgNO₃

PbCl₂, NaCl, ZnCl₂

ZnCO₃, BaSO₄,AgCl Correct answer

Answer Details

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

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Question 12 Report

What is the maximum number of electrons that an f-orbital can accommodate?

14 Correct answer

Answer Details

Read lesson note on Structure Of The Atom (WAEC)

Structure Of The Atom

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Question 13 Report

\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is

\( ^0_1e \)

\( ^0_{-1}e \) Correct answer

\( ^4_2He \)

\( ^1_0n \)

\( ^1_1p\)

Answer Details

Read lesson note on Chemical Equilibria (JAMB)

Chemical Equilibria

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Question 14 Report

The type of reaction ethyne mainly undergoes is

addition Correct answer

carboxylation.

esterification

saponification

substitution

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 15 Report

Which of these arrangement of elements is in order of increasing ionization energy?

Boron, Carbon, Flourine, Nitrogen

Boron, Carbon, Nitrogen, Flourine Correct answer

Carbon, Boron, Nitrogen, Flourine

Flourine, Nitro9en, Carbon, Boron

Nitrogen, Flourine, Carbon, Boron

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 16 Report

Which of the following compounds is unsaturated?

Cyclohexane

Methoxyethane

1 ,2-dibromoethane

2,2,3-trimethylpentane

3-methylbut-l-ene Correct answer

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 17 Report

When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as

Brownian movement.

Dialysis

Diffusion

Osmosis

Tyndall effect Correct answer

Answer Details

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

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Question 18 Report

Which of these is NOT a physical property f water?

Can be used to dissolve organic substances Correct answer

Has a boiling point of 100 ° C

Has a density of 19cm3 at 40 °C

Has a freezing point of 0 ° C

is neutral to litmus

Answer Details

Read lesson note on Solubility Of Substances (Ghana Only) (WAEC)

Read lesson note on Oxidation And Reduction (JAMB)

Solubility Of Substances (Ghana Only)

Oxidation And Reduction

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Question 19 Report

The gas in air used by plants for photosynthesis is

Argon

Carbon (IV) oxide Correct answer

Nitrogen

Oxygen

Water vapour.

Answer Details

Read lesson note on Air (JAMB)

Air

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Question 20 Report

Chlorine atom forms Cl- by

donating lone pair of electrons

gaining an electron Correct answer

losing an electron

sharing an electron

sharing a lone pair of electrons.

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 21 Report

Bauxite is the ore of

aluminium Correct answer

calcium

Iron

sodium

magnesium

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 22 Report

In which of the following equations can Le-chartelier’s principle be applied?

H₂(g)+S(g) → H₂(g)

2H₂S(g) + O₂ (g) → 2H2O(l) + 2SO₂(g)

N₂(g) +3H₂(g) ⇌ 2NH₃(g) Correct answer

NaOH(aq) +CO₂(g) → Na₂CO₃(aq) + H₂O(l)

S(s) + 0₂(g) → SO₂(g)

Answer Details

Read lesson note on Chemical Equilibria (JAMB)

Chemical Equilibria

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Question 23 Report

A chemical system is at equilibrium when

δ G is positive

δ G is zero Correct answer

δ S is negative

δ S is positive

δ S is zero.

Answer Details

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

Read lesson note on Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

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Question 24 Report

The following gases are diatomic EXCEPT

Fluorine

Helium Correct answer

Hydrogen

Nitrogen

Oxygen

Answer Details

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

Read lesson note on Structure Of The Atom (WAEC)

Acids, Bases And Salts (Nigeria Only)

Structure Of The Atom

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Question 25 Report

The following acids are monobasic EXCEPT

dioxonitrate (Ill) acid

ethanedioic acid Correct answer

hydrobromic acid

methanoic acid

oxochlorate (I) acid

Answer Details

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

Read lesson note on Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

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Question 26 Report

Brownian motion explains

Boyle’s law

Collision theory

Laws of chemical combination

Molecular motion in liquids and gases Correct answer

Vibrational motion in liquids.

Answer Details

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

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Question 27 Report

A solution is prepared by dissolving I .96g of H₂SO₄ in 250 cm³ of its solution. What is the concentration in moles per dm³?

0.008

0.08 Correct answer

0.1

0.8

8.02

Answer Details

Read lesson note on Solubility (JAMB)

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

Read lesson note on Solutions (WAEC)

Solubility

Solutions

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Question 28 Report

The rate of a chemical reaction is NOT affected by one of these factors

colour Correct answer

concentration

presence of light

surface area

temperature

Answer Details

Read lesson note on Rates Of Chemical Reaction (JAMB)

Read lesson note on Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Rates Of Chemical Reaction

Chemical Kinetics And Equilibrium Systems (Ghana Only)

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Question 29 Report

During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because

hydrogen ions are in greater concentration than sodium ions.

hydrogen is higher than sodium in the electrochemical series.

hydrogen is lower than sodium in the electrochemical series. Correct answer

of the nature of the electrodes.

the concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte.

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 30 Report

Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m⁵Nm^-2pressure becomes 300cm³ at 1.0 × 10⁵Nm^-2 pressure?

Avogadro’s

Boyle’s Correct answer

Charles’

Faraday’s

Graham’s

Answer Details

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

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Question 31 Report

The planet with the highest number of moon is

Earth

Jupiter Correct answer

Uranus

Pluto

Venus.

Answer Details

Read lesson note on Periodic Chemistry (Nigeria Only) (WAEC)

Periodic Chemistry (Nigeria Only)

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Question 32 Report

The most efficient absorber of ultraviolet radiation in the atmosphere is

CO₂

H₂

H₂O

0₂

O₃ Correct answer

Answer Details

Read lesson note on Air (JAMB)

Air

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Question 33 Report

Chromatography is used to separate components of mixtures which differ in their rates of

diffusion

migration Correct answer

reaction

sedimentation

sublimation.

Answer Details

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Question 34 Report

Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below?

M(s)+2HC1(aq) → MCI₂ (aq) + H₂(g)

Adding some distilled water

Decreasing the temperature

Diluting the hydrochloric acid

Grinding the metal into powder Correct answer

Increasing the pressure

Answer Details

Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Question 35 Report

The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces

calcium chloride, carbon (IV) oxide and water Correct answer

calcium chloride, and trioxocarbonate (IV) acid

calcium hydroxide, carbon (IV) oxide and chlorine gas

calcium hydroxide, carbon (IV) oxide and water

calcium metal and water.

Answer Details

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

Acids, Bases And Salts

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Question 36 Report

Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of

combining volumes

conservation of mass Correct answer

definite proportion

multiple proportion

reciprocal proportion.

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 37 Report

The electrode potential in volts of 2H+(aq) / H2(q) system is

-2.87

-2.71

0.8

1.68

\( 0 \) Correct answer

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 38 Report

A measure of the degree of disorderliness in a chemical system is known as the

activation energy

enthalpy

entropy Correct answer

equilibrium

free energy.

Answer Details

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

Read lesson note on Energy Changes (JAMB)

Energy Changes

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Question 39 Report

What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?

Covalent

Dative

Hydrogen Correct answer

Ionic

Metallic

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 40 Report

What is the colour of phenolphthalein indicator in a basic medium?

Blue

Colourless

Orange

Pink Correct answer

Yellow

Answer Details

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

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Question 41 Report

If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula

XZ₂

X₂Z

X₂Z₃ Correct answer

X₃Z₂

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)