NECO SSCE - Chemistry - 2009

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Pregunta 2 Informe

The rate of a reaction usually increases with increase in the concentration of reactants because the

distance between particles of the reactants increases

frequency of collision of particles is lower

particles of the reactants gain energy and move faster

reactants from a complex which decomposes rapidly

reactants occupy a higher energy level

Detalles de la respuesta

Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Pregunta 3 Informe

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99

uranium235

uranium 238

Detalles de la respuesta

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

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Pregunta 4 Informe

Which of the following salt solutions will have a pH greater than 7?

NaCl

NaHSO₄

Na₂CO₄

Na₂SO₄

MgCl₂

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 5 Informe

What volume of carbon (IV) oxide in dm ³ is produced at s.t.p. when 2.50g of CaCO₃ reacts with excess acid according to the following equation? CaCO₃(s) + 2HCI(aq) → CaCl₂(aq) + H₂O(1) + CO₂(g)

[CaCO₂ 100; molar volume of a gas at s.t.p. = 22.4dm ³]

0.28

0.56

2.24

5.6

11.2

Detalles de la respuesta

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Pregunta 6 Informe

Which of the following gases is absorbed from the air dun photosynthesis?

Carbon (II) oxide

Carbon (IV) oxide

Nitrogen

Noble gases

Oxygen

Detalles de la respuesta

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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Pregunta 7 Informe

Which of the following equations is NOT balanced?

CH₄(g) + 20₂(9) → CO₂(g) + 2H₂O(g)

CU(S) + HNO₃(aq) → Cu(NO₃)₂(aq) + 4H₂O(I) + NO(g)

2KCIO₃(s) → 2KCI(s)+ 3O₂(g)

NaH(s) + H₂O(1) → NaOH(aq) +H₂(g)

Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2NaCl(aq)

Detalles de la respuesta

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Pregunta 8 Informe

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent

fluorescent

hygroscopic

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 9 Informe

What kind of bond exist between carbon and oxygen in C0₃ ^2-?

Co- ordinate Covalent

covalent

Electrovalent

Metallic

Van der Waal forces

Detalles de la respuesta

Read lesson note on Atomic Structure And Bonding (JAMB)

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Pregunta 10 Informe

The following equations represent redox reactions EXCEPT

Ba²⁺(aq) + SO^2-₄ (aq) → BaSO₄(s)

Cl₂(g) + 2Br^- (aq) → 2CI ^- (aq) + Br₂(g)

Fe²⁺(aq) + ½ C I₂(aq) → Fe³⁺ (aq) + CI^-(aq)

2Fe³⁺(aq) + Sn²⁺(aq) → 2Fe²⁺(aq) Sn⁴⁺ (aq)

Zn(s) + CU²⁺(aq) → Zn²⁺(aq) + CU(s)

Detalles de la respuesta

Read lesson note on Redox Reactions (WAEC)

Redox Reactions

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Pregunta 11 Informe

If the volume of a gas at 35°C is 60cm³, what would be its volume in cm³ at 273k?

39.03

46.81

53.18

67.69

76.92

Detalles de la respuesta

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

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Pregunta 12 Informe

Which of the following gases will bleach moist litmus paper?

Cl₂

CO₂

HCl

N₂O

SO₃

Detalles de la respuesta

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

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Pregunta 13 Informe

The following are ores of metals EXCEPT

bauxite

dolomite

graphite

haematite

magnetite

Detalles de la respuesta

Read lesson note on Metals And Their Compounds (JAMB)

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

Metals And Their Compounds

Separation Of Mixtures And Purification Of Chemical Substances

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Pregunta 14 Informe

A neon atom is chemically nonreactive because

the electrons at the outermost shell is partially filled

the number of protons equals the number of electrons

the outer electron shell is completely filled

there are equal number of protons and neutrons in its nucleus

there are no elections at the outermost shell

Detalles de la respuesta

Read lesson note on Atomic Structure And Bonding (JAMB)

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Pregunta 15 Informe

A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is

ammonia

carbon(IV)oxide

hydrogen chloride

sulphur (IV) oxide

sulphur (VI) oxide

Detalles de la respuesta

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

Acids, Bases And Salts (Ghana Only)

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Pregunta 16 Informe

How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?

Detalles de la respuesta

Read lesson note on Atomic Structure And Bonding (JAMB)

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Pregunta 17 Informe

Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding

covalent

dative

electrovalent

hydrogen

metallic

Detalles de la respuesta

Read lesson note on Atomic Structure And Bonding (JAMB)

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Pregunta 18 Informe

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron

Magnesium

Sodium

Detalles de la respuesta

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pregunta 19 Informe

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV)

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 20 Informe

C\(_6\)H\(_{12}\)O\(_6\)

What is the molar mass of the compound above?

[ H=1, C=12, O=16 }

180

123

244

Detalles de la respuesta

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

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Pregunta 21 Informe

Atomic size decreases

across a period from left to right

across a period from right to left

diagonally down the group

down a group

with decrease in atomic number

Detalles de la respuesta

Read lesson note on Structure Of The Atom (Ghana Only) (WAEC)

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

Read lesson note on Chemical Industry And Environment (WAEC)

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

Read lesson note on Atomic Structure And Bonding (JAMB)

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

Structure Of The Atom (Ghana Only)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Chemical Industry And Environment

Periodic Chemistry (Nigeria Only)

Periodic Chemistry (Ghana Only)

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Pregunta 22 Informe

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine

Detalles de la respuesta

Read lesson note on States Of Matter (WAEC)

States Of Matter

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Pregunta 23 Informe

Which of the following is NOT a fraction of petroleum?

Bitumen

Coal

Diesel

Kerosene

Petrol

Detalles de la respuesta

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

Solubility Of Substances (Ghana Only)

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Pregunta 24 Informe

Which of the following statements is NOT correct of group VII elements? They

are diatomic

are good oxidizing agents

are highly electronegative

have high electron affinity

have relatively low ionization potentials

Detalles de la respuesta

Read lesson note on Atomic Structure And Bonding (JAMB)

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Pregunta 25 Informe

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃

S0₃

Detalles de la respuesta

Read lesson note on Water (JAMB)

Read lesson note on Oxidation And Reduction (JAMB)

Water

Oxidation And Reduction

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Pregunta 26 Informe

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF

Detalles de la respuesta

Read lesson note on Oxidation And Reduction (JAMB)

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

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

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Pregunta 27 Informe

Ptotal = P1 + P2 + P3 +…………. Pn, is an expression of law

Boyle’s

Charles’

Dalton’s

Graham’s

Gay Lussac’s

Detalles de la respuesta

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

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Pregunta 28 Informe

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

CH₃

CH₄

C₂H₂

C₂H₆

Detalles de la respuesta

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

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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Pregunta 29 Informe

How many zones are present in a luminous Bunsen burner flame?

Detalles de la respuesta

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Pregunta 30 Informe

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI

Detalles de la respuesta

Read lesson note on Energy And Energy Changes (WAEC)

Energy And Energy Changes

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Pregunta 31 Informe

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification

halogenation

hydrogenation

saponification

Detalles de la respuesta

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

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Pregunta 32 Informe

\( ^{235}_{92}U + ^1_0n → ^{145}_{56}Ba + ^{88}_{36}Kr + 3^1_0n + Energy \)

The equation above represent a/an

alpha particle emission

endothermic reaction

nuclear fission

nuclear fusion

thermal dissociation

Detalles de la respuesta

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

Chemical Bonds (Nigeria Only)

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Pregunta 33 Informe

The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is

CH₂

CH₃

C₂H₂

C₂H₄

C₂H₆

Detalles de la respuesta

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Pregunta 34 Informe

The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT

HOCH₂ – CH₂OH

H₂C –C =C– CH₃

H₃C – HC = CH₂

H₂C = CH₂

H₃C – C =CH

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 35 Informe

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces

Detalles de la respuesta

Read lesson note on Atomic Structure And Bonding (JAMB)

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Pregunta 36 Informe

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT

PV =KT

V1/T1 = V2/T2

Detalles de la respuesta

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

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Pregunta 37 Informe

In the electrolysis of dilute tetraoxosulphate (VI) acid using platinum electrodes, the products obtained at the anode are cathode respectively are

hydrogen, oxygen

Hydrogen, tetraoxosulphate (VI) ion

oxygen, hydrogen

sulphur, hydrogen

sulphur, oxygen

Detalles de la respuesta

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pregunta 38 Informe

The relationship between equilibrium constant and free energy change is represented as

δ G ° =-nFE °

δG °-RT ln K

δ G °= + RT In k

δG ° = δH – T S

H=TδS

Detalles de la respuesta

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

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Pregunta 39 Informe

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Degree of acidity

Enthalpy change

Equilibrium constant

Ionic product of water

Solubility product

Detalles de la respuesta

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

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

Solubility Of Substances (Ghana Only)

Acids, Bases And Salts (Ghana Only)

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Pregunta 40 Informe

The green house effect is a climatic condition associated with the presence of excess

carbon (II) oxide

carbon (IV) oxide

hydrogen sulphide

nitrogen (II) oxide

oxygen

Detalles de la respuesta

Read lesson note on Environmental Pollution (JAMB)

Environmental Pollution

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Pregunta 41 Informe

Compound with the general formula CnH\(_{2n+2}\) belong to the_______ group

alkanal

alkane

alkanoate

alkene

alkyne

Detalles de la respuesta

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