NECO SSCE - Chemistry - 2009

Tazama Jibu

Swali 2 Ripoti

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF

Maelezo ya Majibu

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

Tazama Jibu

Swali 3 Ripoti

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

carbon

crylite

limestone

oxygen

sulphur

Maelezo ya Majibu

Soma maelezo ya somo kwenye Organic Compounds (JAMB)

Organic Compounds

Tazama Jibu

Swali 4 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 5 Ripoti

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV)

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 6 Ripoti

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

Boyle’s

Charles’

Dalton’s

Graham’s

Gay Lussac’s

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 7 Ripoti

All the following belong to the same family EXCEPT

glycerol

nylon

perspex polyethene

polyethene

polystyrene

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Bonds (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Chemical Bonds (Ghana Only)

Periodic Chemistry (Ghana Only)

Tazama Jibu

Swali 8 Ripoti

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

Carbon (II) oxide

Carbon (IV) oxide

Nitrogen

Noble gases

Oxygen

Maelezo ya Majibu

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 9 Ripoti

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

The equation above represent a/an

alpha particle emission

endothermic reaction

nuclear fission

nuclear fusion

thermal dissociation

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Bonds (Nigeria Only) (WAEC)

Chemical Bonds (Nigeria Only)

Tazama Jibu

Swali 10 Ripoti

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine

Maelezo ya Majibu

Soma maelezo ya somo kwenye States Of Matter (WAEC)

States Of Matter

Tazama Jibu

Swali 11 Ripoti

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)

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

Tazama Jibu

Swali 12 Ripoti

Which of the following is NOT a fraction of petroleum?

Bitumen

Coal

Diesel

Kerosene

Petrol

Maelezo ya Majibu

Soma maelezo ya somo kwenye Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Tazama Jibu

Swali 13 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 14 Ripoti

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

Carbon

Chlorine

Nitrogen

Phosphorus

Sulphur

Maelezo ya Majibu

Soma maelezo ya somo kwenye Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Tazama Jibu

Swali 15 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 16 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

Tazama Jibu

Swali 17 Ripoti

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

alkanal

alkane

alkanoate

alkene

alkyne

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Tazama Jibu

Swali 18 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Solubility Of Substances (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Acids, Bases And Salts (Ghana Only)

Tazama Jibu

Swali 19 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Tazama Jibu

Swali 20 Ripoti

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

CH₂

CH₃

C₂H₂

C₂H₄

C₂H₆

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Chemical Combination

Tazama Jibu

Swali 21 Ripoti

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

Co- ordinate Covalent

covalent

Electrovalent

Metallic

Van der Waal forces

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 22 Ripoti

Which of the following gases will bleach moist litmus paper?

Cl₂

CO₂

HCl

N₂O

SO₃

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 23 Ripoti

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent

fluorescent

hygroscopic

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 24 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 25 Ripoti

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

NaCl

NaHSO₄

Na₂CO₄

Na₂SO₄

MgCl₂

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 26 Ripoti

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃

S0₃

Maelezo ya Majibu

Soma maelezo ya somo kwenye Water (JAMB)

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Water

Oxidation And Reduction

Tazama Jibu

Swali 27 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Environmental Pollution (JAMB)

Environmental Pollution

Tazama Jibu

Swali 28 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 29 Ripoti

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT

PV =KT

V1/T1 = V2/T2

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 30 Ripoti

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

dehydration

esterification

fermentation

polymerization

saponification

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Tazama Jibu

Swali 31 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 32 Ripoti

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 33 Ripoti

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

nitrogen and carbon (IV) oxide

nitrogen and noble gases

nitrogen and oxygen

nitrogen, carbon (VI) oxide and noble gases

the noble gases

Maelezo ya Majibu

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 34 Ripoti

The following are ores of metals EXCEPT

bauxite

dolomite

graphite

haematite

magnetite

Maelezo ya Majibu

Soma maelezo ya somo kwenye Metals And Their Compounds (JAMB)

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Metals And Their Compounds

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 35 Ripoti

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI

Maelezo ya Majibu

Soma maelezo ya somo kwenye Energy And Energy Changes (WAEC)

Energy And Energy Changes

Tazama Jibu

Swali 36 Ripoti

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

0.64

3.18

6.35

9.65

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Soma maelezo ya somo kwenye Acids, Bases And Salts (Nigeria Only) (WAEC)

Electrolysis

Acids, Bases And Salts (Nigeria Only)

Tazama Jibu

Swali 37 Ripoti

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification

halogenation

hydrogenation

saponification

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Tazama Jibu

Swali 38 Ripoti

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron

Magnesium

Sodium

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 39 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Structure Of The Atom (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Chemical Industry And Environment (WAEC)

Soma maelezo ya somo kwenye Periodic Chemistry (Nigeria Only) (WAEC)

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Soma maelezo ya somo kwenye 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)

Tazama Jibu

Swali 40 Ripoti

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99

uranium235

uranium 238

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Tazama Jibu

Swali 41 Ripoti

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)

Maelezo ya Majibu

Soma maelezo ya somo kwenye Redox Reactions (WAEC)

Redox Reactions

Tazama Jibu

Swali 42 Ripoti

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

HOCH₂ – CH₂OH

H₂C –C =C– CH₃

H₃C – HC = CH₂

H₂C = CH₂

H₃C – C =CH

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 43 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Tazama Jibu

Swali 44 Ripoti

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

What is the molar mass of the compound above?

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

180

123

244

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Tazama Jibu

Swali 45 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)