NECO SSCE - Chemistry - 2009 (Objective)

Duba Amsa

Tambaya 3 Rahoto

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

CH₃ Amsar da ta dace

CH₄

C₂H₂

C₂H₆

Bayanin Amsa

Karanta bayanin darasi akan Kinetic Theory Of Matter And Gas Laws (JAMB)

Karanta bayanin darasi akan Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Duba Amsa

Tambaya 4 Rahoto

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 Amsar da ta dace

67.69

76.92

Bayanin Amsa

Karanta bayanin darasi akan Kinetic Theory Of Matter And Gas Laws (JAMB)

Duba Amsa

Tambaya 5 Rahoto

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification Amsar da ta dace

halogenation

hydrogenation

saponification

Bayanin Amsa

Karanta bayanin darasi akan Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Duba Amsa

Tambaya 6 Rahoto

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 Amsar da ta dace

0.64

3.18

6.35

9.65

Bayanin Amsa

Karanta bayanin darasi akan Electrolysis (JAMB)

Karanta bayanin darasi akan Acids, Bases And Salts (Nigeria Only) (WAEC)

Electrolysis

Acids, Bases And Salts (Nigeria Only)

Duba Amsa

Tambaya 7 Rahoto

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

What is the molar mass of the compound above?

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

180 Amsar da ta dace

123

244

Bayanin Amsa

Karanta bayanin darasi akan Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Duba Amsa

Tambaya 8 Rahoto

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

NaCl

NaHSO₄

Na₂CO₄ Amsar da ta dace

Na₂SO₄

MgCl₂

Bayanin Amsa

Karanta bayanin darasi akan Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Duba Amsa

Tambaya 9 Rahoto

The following equations represent redox reactions EXCEPT

Ba²⁺(aq) + SO^2-₄ (aq) → BaSO₄(s) Amsar da ta dace

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)

Bayanin Amsa

Karanta bayanin darasi akan Redox Reactions (WAEC)

Redox Reactions

Duba Amsa

Tambaya 10 Rahoto

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

Co- ordinate Covalent

covalent Amsar da ta dace

Electrovalent

Metallic

Van der Waal forces

Bayanin Amsa

Karanta bayanin darasi akan Atomic Structure And Bonding (JAMB)

Duba Amsa

Tambaya 11 Rahoto

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

HOCH₂ – CH₂OH Amsar da ta dace

H₂C –C =C– CH₃

H₃C – HC = CH₂

H₂C = CH₂

H₃C – C =CH

Bayanin Amsa

Karanta bayanin darasi akan Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Duba Amsa

Tambaya 12 Rahoto

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

dehydration

esterification

fermentation Amsar da ta dace

polymerization

saponification

Bayanin Amsa

Karanta bayanin darasi akan Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Duba Amsa

Tambaya 13 Rahoto

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine Amsar da ta dace

Bayanin Amsa

Karanta bayanin darasi akan States Of Matter (WAEC)

States Of Matter

Duba Amsa

Tambaya 14 Rahoto

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

nitrogen and carbon (IV) oxide

nitrogen and noble gases Amsar da ta dace

nitrogen and oxygen

nitrogen, carbon (VI) oxide and noble gases

the noble gases

Bayanin Amsa

Karanta bayanin darasi akan Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Duba Amsa

Tambaya 15 Rahoto

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

CH₂

CH₃ Amsar da ta dace

C₂H₂

C₂H₄

C₂H₆

Bayanin Amsa

Karanta bayanin darasi akan Chemical Combination (JAMB)

Chemical Combination

Duba Amsa

Tambaya 16 Rahoto

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 Amsar da ta dace

hydrogen

metallic

Bayanin Amsa

Karanta bayanin darasi akan Atomic Structure And Bonding (JAMB)

Duba Amsa

Tambaya 17 Rahoto

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF Amsar da ta dace

Bayanin Amsa

Karanta bayanin darasi akan Oxidation And Reduction (JAMB)

Karanta bayanin darasi akan Acids, Bases And Salts (Ghana Only) (WAEC)

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

Duba Amsa

Tambaya 18 Rahoto

Which of the following is NOT a fraction of petroleum?

Bitumen

Coal Amsar da ta dace

Diesel

Kerosene

Petrol

Bayanin Amsa

Karanta bayanin darasi akan Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Duba Amsa

Tambaya 19 Rahoto

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 Amsar da ta dace

reactants occupy a higher energy level

Bayanin Amsa

Karanta bayanin darasi akan Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

Duba Amsa

Tambaya 20 Rahoto

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 Amsar da ta dace

Bayanin Amsa

Karanta bayanin darasi akan Atomic Structure And Bonding (JAMB)

Duba Amsa

Tambaya 21 Rahoto

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron Amsar da ta dace

Magnesium

Sodium

Bayanin Amsa

Karanta bayanin darasi akan Electrolysis (JAMB)

Electrolysis

Duba Amsa

Tambaya 22 Rahoto

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 Amsar da ta dace

2.24

5.6

11.2

Bayanin Amsa

Karanta bayanin darasi akan Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

Duba Amsa

Tambaya 23 Rahoto

Atomic size decreases

across a period from left to right Amsar da ta dace

across a period from right to left

diagonally down the group

down a group

with decrease in atomic number

Bayanin Amsa

Karanta bayanin darasi akan Structure Of The Atom (Ghana Only) (WAEC)

Karanta bayanin darasi akan Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Karanta bayanin darasi akan Chemical Industry And Environment (WAEC)

Karanta bayanin darasi akan Periodic Chemistry (Nigeria Only) (WAEC)

Karanta bayanin darasi akan Atomic Structure And Bonding (JAMB)

Karanta bayanin darasi akan 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)

Duba Amsa

Tambaya 24 Rahoto

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

δ G ° =-nFE °

δG °-RT ln K Amsar da ta dace

δ G °= + RT In k

δG ° = δH – T S

H=TδS

Bayanin Amsa

Karanta bayanin darasi akan Kinetic Theory Of Matter And Gas Laws (JAMB)

Duba Amsa

Tambaya 25 Rahoto

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces Amsar da ta dace

Bayanin Amsa

Karanta bayanin darasi akan Atomic Structure And Bonding (JAMB)

Duba Amsa

Tambaya 26 Rahoto

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99 Amsar da ta dace

uranium235

uranium 238

Bayanin Amsa

Karanta bayanin darasi akan Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Duba Amsa

Tambaya 27 Rahoto

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) Amsar da ta dace

2KCIO₃(s) → 2KCI(s)+ 3O₂(g)

NaH(s) + H₂O(1) → NaOH(aq) +H₂(g)

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

Bayanin Amsa

Karanta bayanin darasi akan Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

Duba Amsa

Tambaya 28 Rahoto

Which of the following gases will bleach moist litmus paper?

Cl₂ Amsar da ta dace

CO₂

HCl

N₂O

SO₃

Bayanin Amsa

Karanta bayanin darasi akan Kinetic Theory Of Matter And Gas Laws (JAMB)

Duba Amsa

Tambaya 29 Rahoto

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

6 Amsar da ta dace

Bayanin Amsa

Karanta bayanin darasi akan Atomic Structure And Bonding (JAMB)

Duba Amsa

Tambaya 30 Rahoto

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 Amsar da ta dace

there are equal number of protons and neutrons in its nucleus

there are no elections at the outermost shell

Bayanin Amsa

Karanta bayanin darasi akan Atomic Structure And Bonding (JAMB)

Duba Amsa

Tambaya 31 Rahoto

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 Amsar da ta dace

sulphur, hydrogen

sulphur, oxygen

Bayanin Amsa

Karanta bayanin darasi akan Electrolysis (JAMB)

Electrolysis

Duba Amsa

Tambaya 32 Rahoto

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

carbon (II) oxide

carbon (IV) oxide Amsar da ta dace

hydrogen sulphide

nitrogen (II) oxide

oxygen

Bayanin Amsa

Karanta bayanin darasi akan Environmental Pollution (JAMB)

Environmental Pollution

Duba Amsa

Tambaya 33 Rahoto

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

ammonia Amsar da ta dace

carbon(IV)oxide

hydrogen chloride

sulphur (IV) oxide

sulphur (VI) oxide

Bayanin Amsa

Karanta bayanin darasi akan Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Duba Amsa

Tambaya 34 Rahoto

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

4 Amsar da ta dace

Bayanin Amsa

Duba Amsa

Tambaya 35 Rahoto

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI Amsar da ta dace

Bayanin Amsa

Karanta bayanin darasi akan Energy And Energy Changes (WAEC)

Energy And Energy Changes

Duba Amsa

Tambaya 36 Rahoto

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV) Amsar da ta dace

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

Bayanin Amsa

Karanta bayanin darasi akan Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Duba Amsa

Tambaya 37 Rahoto

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent Amsar da ta dace

fluorescent

hygroscopic

Bayanin Amsa

Karanta bayanin darasi akan Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Duba Amsa

Tambaya 38 Rahoto

All the following belong to the same family EXCEPT

glycerol Amsar da ta dace

nylon

perspex polyethene

polyethene

polystyrene

Bayanin Amsa

Karanta bayanin darasi akan Chemical Bonds (Ghana Only) (WAEC)

Karanta bayanin darasi akan Periodic Chemistry (Ghana Only) (WAEC)

Chemical Bonds (Ghana Only)

Periodic Chemistry (Ghana Only)

Duba Amsa

Tambaya 39 Rahoto

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Degree of acidity Amsar da ta dace

Enthalpy change

Equilibrium constant

Ionic product of water

Solubility product

Bayanin Amsa

Karanta bayanin darasi akan Solubility Of Substances (Ghana Only) (WAEC)

Karanta bayanin darasi akan Acids, Bases And Salts (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Acids, Bases And Salts (Ghana Only)

Duba Amsa

Tambaya 40 Rahoto

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

alkanal

alkane Amsar da ta dace

alkanoate

alkene

alkyne

Bayanin Amsa

Karanta bayanin darasi akan Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Duba Amsa

Tambaya 41 Rahoto

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT Amsar da ta dace

PV =KT

V1/T1 = V2/T2

Bayanin Amsa

Karanta bayanin darasi akan Kinetic Theory Of Matter And Gas Laws (JAMB)

Duba Amsa

Tambaya 42 Rahoto

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

carbon

crylite

limestone Amsar da ta dace

oxygen

sulphur

Bayanin Amsa

Karanta bayanin darasi akan Organic Compounds (JAMB)

Organic Compounds

Duba Amsa

Tambaya 43 Rahoto

The following are ores of metals EXCEPT

bauxite

dolomite

graphite Amsar da ta dace

haematite

magnetite

Bayanin Amsa

Karanta bayanin darasi akan Metals And Their Compounds (JAMB)

Karanta bayanin darasi akan Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Metals And Their Compounds

Separation Of Mixtures And Purification Of Chemical Substances

Duba Amsa

Tambaya 44 Rahoto

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

Carbon (II) oxide

Carbon (IV) oxide Amsar da ta dace

Nitrogen

Noble gases

Oxygen

Bayanin Amsa

Karanta bayanin darasi akan Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Duba Amsa

Tambaya 45 Rahoto

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃ Amsar da ta dace

S0₃

Bayanin Amsa

Karanta bayanin darasi akan Water (JAMB)

Karanta bayanin darasi akan Oxidation And Reduction (JAMB)

Water

Oxidation And Reduction

Duba Amsa

Tambaya 46 Rahoto

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

The equation above represent a/an

alpha particle emission

endothermic reaction

nuclear fission Amsar da ta dace

nuclear fusion

thermal dissociation

Bayanin Amsa

Karanta bayanin darasi akan Chemical Bonds (Nigeria Only) (WAEC)

Chemical Bonds (Nigeria Only)

Duba Amsa

Tambaya 47 Rahoto

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

Brownian Amsar da ta dace

Dalton

Gay Lussac

Graham

Newton

Bayanin Amsa

Karanta bayanin darasi akan Kinetic Theory Of Matter And Gas Laws (JAMB)