NECO SSCE - Chemistry - 2009 (Objective)

Wo Idahun

Ibeere 3 Ìròyìn

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

ammonia Ìdáhùn tó tọ́

carbon(IV)oxide

hydrogen chloride

sulphur (IV) oxide

sulphur (VI) oxide

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Wo Idahun

Ibeere 4 Ìròyìn

What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]

0.32 Ìdáhùn tó tọ́

0.64

3.18

6.35

9.65

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Nigeria Only) (WAEC)

Electrolysis

Acids, Bases And Salts (Nigeria Only)

Wo Idahun

Ibeere 5 Ìròyìn

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

Carbon (II) oxide

Carbon (IV) oxide Ìdáhùn tó tọ́

Nitrogen

Noble gases

Oxygen

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Wo Idahun

Ibeere 6 Ìròyìn

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV) Ìdáhùn tó tọ́

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 7 Ìròyìn

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

CH₂

CH₃ Ìdáhùn tó tọ́

C₂H₂

C₂H₄

C₂H₆

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Combination (JAMB)

Chemical Combination

Wo Idahun

Ibeere 8 Ìròyìn

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

6 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 9 Ìròyìn

When air is passed through alkaline pyrogallol and then lime water, the gases left are

nitrogen and carbon (IV) oxide

nitrogen and noble gases Ìdáhùn tó tọ́

nitrogen and oxygen

nitrogen, carbon (VI) oxide and noble gases

the noble gases

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Wo Idahun

Ibeere 10 Ìròyìn

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) Ìdáhùn tó tọ́

2KCIO₃(s) → 2KCI(s)+ 3O₂(g)

NaH(s) + H₂O(1) → NaOH(aq) +H₂(g)

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

Wo Idahun

Ibeere 11 Ìròyìn

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

HOCH₂ – CH₂OH Ìdáhùn tó tọ́

H₂C –C =C– CH₃

H₃C – HC = CH₂

H₂C = CH₂

H₃C – C =CH

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 12 Ìròyìn

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 Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 13 Ìròyìn

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 Ìdáhùn tó tọ́

reactants occupy a higher energy level

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

Wo Idahun

Ibeere 14 Ìròyìn

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 15 Ìròyìn

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Degree of acidity Ìdáhùn tó tọ́

Enthalpy change

Equilibrium constant

Ionic product of water

Solubility product

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Solubility Of Substances (Ghana Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Acids, Bases And Salts (Ghana Only)

Wo Idahun

Ibeere 16 Ìròyìn

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 Ìdáhùn tó tọ́

sulphur, hydrogen

sulphur, oxygen

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Electrolysis

Wo Idahun

Ibeere 17 Ìròyìn

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 Ìdáhùn tó tọ́

67.69

76.92

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 18 Ìròyìn

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 Ìdáhùn tó tọ́

2.24

5.6

11.2

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

Wo Idahun

Ibeere 19 Ìròyìn

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

carbon (II) oxide

carbon (IV) oxide Ìdáhùn tó tọ́

hydrogen sulphide

nitrogen (II) oxide

oxygen

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Environmental Pollution (JAMB)

Environmental Pollution

Wo Idahun

Ibeere 20 Ìròyìn

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

carbon

crylite

limestone Ìdáhùn tó tọ́

oxygen

sulphur

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Organic Compounds (JAMB)

Organic Compounds

Wo Idahun

Ibeere 21 Ìròyìn

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Oxidation And Reduction (JAMB)

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

Wo Idahun

Ibeere 22 Ìròyìn

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

δ G ° =-nFE °

δG °-RT ln K Ìdáhùn tó tọ́

δ G °= + RT In k

δG ° = δH – T S

H=TδS

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 23 Ìròyìn

Atomic size decreases

across a period from left to right Ìdáhùn tó tọ́

across a period from right to left

diagonally down the group

down a group

with decrease in atomic number

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Structure Of The Atom (Ghana Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Chemical Industry And Environment (WAEC)

Ka ìwé ẹ̀kọ́ nípa Periodic Chemistry (Nigeria Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Ka ìwé ẹ̀kọ́ nípa 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)

Wo Idahun

Ibeere 24 Ìròyìn

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

Boyle’s

Charles’

Dalton’s Ìdáhùn tó tọ́

Graham’s

Gay Lussac’s

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 25 Ìròyìn

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

Carbon

Chlorine Ìdáhùn tó tọ́

Nitrogen

Phosphorus

Sulphur

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Wo Idahun

Ibeere 26 Ìròyìn

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT Ìdáhùn tó tọ́

PV =KT

V1/T1 = V2/T2

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 27 Ìròyìn

Which of the following gases will bleach moist litmus paper?

Cl₂ Ìdáhùn tó tọ́

CO₂

HCl

N₂O

SO₃

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 28 Ìròyìn

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

Co- ordinate Covalent

covalent Ìdáhùn tó tọ́

Electrovalent

Metallic

Van der Waal forces

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 29 Ìròyìn

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

4 Ìdáhùn tó tọ́

Awọn alaye Idahun

Wo Idahun

Ibeere 30 Ìròyìn

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron Ìdáhùn tó tọ́

Magnesium

Sodium

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Electrolysis

Wo Idahun

Ibeere 31 Ìròyìn

The following are ores of metals EXCEPT

bauxite

dolomite

graphite Ìdáhùn tó tọ́

haematite

magnetite

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Metals And Their Compounds (JAMB)

Ka ìwé ẹ̀kọ́ nípa Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Metals And Their Compounds

Separation Of Mixtures And Purification Of Chemical Substances

Wo Idahun

Ibeere 32 Ìròyìn

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

CH₃ Ìdáhùn tó tọ́

CH₄

C₂H₂

C₂H₆

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Ka ìwé ẹ̀kọ́ nípa Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Wo Idahun

Ibeere 33 Ìròyìn

The following equations represent redox reactions EXCEPT

Ba²⁺(aq) + SO^2-₄ (aq) → BaSO₄(s) Ìdáhùn tó tọ́

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)

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Redox Reactions (WAEC)

Redox Reactions

Wo Idahun

Ibeere 34 Ìròyìn

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 Ìdáhùn tó tọ́

there are equal number of protons and neutrons in its nucleus

there are no elections at the outermost shell

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 35 Ìròyìn

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent Ìdáhùn tó tọ́

fluorescent

hygroscopic

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 36 Ìròyìn

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

NaCl

NaHSO₄

Na₂CO₄ Ìdáhùn tó tọ́

Na₂SO₄

MgCl₂

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 37 Ìròyìn

All the following belong to the same family EXCEPT

glycerol Ìdáhùn tó tọ́

nylon

perspex polyethene

polyethene

polystyrene

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Bonds (Ghana Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Periodic Chemistry (Ghana Only) (WAEC)

Chemical Bonds (Ghana Only)

Periodic Chemistry (Ghana Only)

Wo Idahun

Ibeere 38 Ìròyìn

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃ Ìdáhùn tó tọ́

S0₃

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Water (JAMB)

Ka ìwé ẹ̀kọ́ nípa Oxidation And Reduction (JAMB)

Water

Oxidation And Reduction

Wo Idahun

Ibeere 39 Ìròyìn

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

Brownian Ìdáhùn tó tọ́

Dalton

Gay Lussac

Graham

Newton

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 40 Ìròyìn

Which of the following is NOT a fraction of petroleum?

Bitumen

Coal Ìdáhùn tó tọ́

Diesel

Kerosene

Petrol

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Wo Idahun

Ibeere 41 Ìròyìn

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification Ìdáhùn tó tọ́

halogenation

hydrogenation

saponification

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Wo Idahun

Ibeere 42 Ìròyìn

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

What is the molar mass of the compound above?

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

180 Ìdáhùn tó tọ́

123

244

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Wo Idahun

Ibeere 43 Ìròyìn

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 Ìdáhùn tó tọ́

hydrogen

metallic

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Wo Idahun

Ibeere 44 Ìròyìn

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa States Of Matter (WAEC)

States Of Matter

Wo Idahun

Ibeere 45 Ìròyìn

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99 Ìdáhùn tó tọ́

uranium235

uranium 238

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Wo Idahun

Ibeere 46 Ìròyìn

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

dehydration

esterification

fermentation Ìdáhùn tó tọ́

polymerization

saponification

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)