NECO SSCE - Chemistry - 2009 (Objective)

Separation Of Mixtures And Purification Of Chemical Substances

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Question 3 Report

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 Correct answer

reactants occupy a higher energy level

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Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Question 4 Report

Which of the following non-metals reacts most readily with metals?

Carbon

Chlorine Correct answer

Nitrogen

Phosphorus

Sulphur

Answer Details

Read lesson note on Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

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Question 5 Report

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification Correct answer

halogenation

hydrogenation

saponification

Answer Details

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

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Question 6 Report

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI Correct answer

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Read lesson note on Energy And Energy Changes (WAEC)

Energy And Energy Changes

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Question 7 Report

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

6 Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 8 Report

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV) Correct answer

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

Answer Details

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

Acids, Bases And Salts

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Question 9 Report

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99 Correct answer

uranium235

uranium 238

Answer Details

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

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Question 10 Report

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT Correct answer

PV =KT

V1/T1 = V2/T2

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

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Question 11 Report

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 Correct answer

there are equal number of protons and neutrons in its nucleus

there are no elections at the outermost shell

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Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 12 Report

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

CH₂

CH₃ Correct answer

C₂H₂

C₂H₄

C₂H₆

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Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 13 Report

During the extraction of iron in the blast furnance, slag is produced using

carbon

crylite

limestone Correct answer

oxygen

sulphur

Answer Details

Read lesson note on Organic Compounds (JAMB)

Organic Compounds

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Question 14 Report

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

The equation above represent a/an

alpha particle emission

endothermic reaction

nuclear fission Correct answer

nuclear fusion

thermal dissociation

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

Chemical Bonds (Nigeria Only)

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Question 15 Report

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

carbon (II) oxide

carbon (IV) oxide Correct answer

hydrogen sulphide

nitrogen (II) oxide

oxygen

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Read lesson note on Environmental Pollution (JAMB)

Environmental Pollution

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Question 16 Report

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 Correct answer

hydrogen

metallic

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 17 Report

Which of the following gases will bleach moist litmus paper?

Cl₂ Correct answer

CO₂

HCl

N₂O

SO₃

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

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Question 18 Report

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

4 Correct answer

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Question 19 Report

The process involved in the decomposition of sugar by an enzyme is called

dehydration

esterification

fermentation Correct answer

polymerization

saponification

Answer Details

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

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Question 20 Report

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

What is the molar mass of the compound above?

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

180 Correct answer

123

244

Answer Details

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

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Question 21 Report

The following equations represent redox reactions EXCEPT

Ba²⁺(aq) + SO^2-₄ (aq) → BaSO₄(s) Correct answer

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)

Answer Details

Read lesson note on Redox Reactions (WAEC)

Redox Reactions

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Question 22 Report

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

δ G ° =-nFE °

δG °-RT ln K Correct answer

δ G °= + RT In k

δG ° = δH – T S

H=TδS

Answer Details

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

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Question 23 Report

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

Carbon (II) oxide

Carbon (IV) oxide Correct answer

Nitrogen

Noble gases

Oxygen

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 24 Report

The following are ores of metals EXCEPT

bauxite

dolomite

graphite Correct answer

haematite

magnetite

Answer Details

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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Question 25 Report

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

alkanal

alkane Correct answer

alkanoate

alkene

alkyne

Answer Details

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

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Question 26 Report

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

Boyle’s

Charles’

Dalton’s Correct answer

Graham’s

Gay Lussac’s

Answer Details

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

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Question 27 Report

The scientist who discovered the zig-zag movement of gas molecules is

Brownian Correct answer

Dalton

Gay Lussac

Graham

Newton

Answer Details

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

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Question 28 Report

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 29 Report

Which of the following is NOT a fraction of petroleum?

Bitumen

Coal Correct answer

Diesel

Kerosene

Petrol

Answer Details

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

Solubility Of Substances (Ghana Only)

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Question 30 Report

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

HOCH₂ – CH₂OH Correct answer

H₂C –C =C– CH₃

H₃C – HC = CH₂

H₂C = CH₂

H₃C – C =CH

Answer Details

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

Acids, Bases And Salts

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Question 31 Report

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 Correct answer

2.24

5.6

11.2

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 32 Report

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine Correct answer

Answer Details

Read lesson note on States Of Matter (WAEC)

States Of Matter

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Question 33 Report

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) Correct answer

2KCIO₃(s) → 2KCI(s)+ 3O₂(g)

NaH(s) + H₂O(1) → NaOH(aq) +H₂(g)

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

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Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 34 Report

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Degree of acidity Correct answer

Enthalpy change

Equilibrium constant

Ionic product of water

Solubility product

Answer Details

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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Question 35 Report

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 Correct answer

sulphur, hydrogen

sulphur, oxygen

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 36 Report

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron Correct answer

Magnesium

Sodium

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 37 Report

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent Correct answer

fluorescent

hygroscopic

Answer Details

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

Acids, Bases And Salts

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Question 38 Report

All the following belong to the same family EXCEPT

glycerol Correct answer

nylon

perspex polyethene

polyethene

polystyrene

Answer Details

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

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

Chemical Bonds (Ghana Only)

Periodic Chemistry (Ghana Only)

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Question 39 Report

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 Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)