NECO SSCE - Chemistry - 2009

Separation Of Mixtures And Purification Of Chemical Substances

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Question 4 Rapport

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

Détails de la réponse

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 5 Rapport

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

Détails de la réponse

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

Acids, Bases And Salts (Ghana Only)

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Question 6 Rapport

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)

Détails de la réponse

Read lesson note on Redox Reactions (WAEC)

Redox Reactions

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Question 7 Rapport

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃

S0₃

Détails de la réponse

Read lesson note on Water (JAMB)

Read lesson note on Oxidation And Reduction (JAMB)

Water

Oxidation And Reduction

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Question 8 Rapport

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

Détails de la réponse

Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Question 9 Rapport

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI

Détails de la réponse

Read lesson note on Energy And Energy Changes (WAEC)

Energy And Energy Changes

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Question 10 Rapport

Which of the following is NOT a fraction of petroleum?

Bitumen

Coal

Diesel

Kerosene

Petrol

Détails de la réponse

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

Solubility Of Substances (Ghana Only)

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Question 11 Rapport

Which of the following gases will bleach moist litmus paper?

Cl₂

CO₂

HCl

N₂O

SO₃

Détails de la réponse

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

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Question 12 Rapport

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification

halogenation

hydrogenation

saponification

Détails de la réponse

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

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Question 13 Rapport

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces

Détails de la réponse

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 14 Rapport

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

Co- ordinate Covalent

covalent

Electrovalent

Metallic

Van der Waal forces

Détails de la réponse

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 15 Rapport

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

Brownian

Dalton

Gay Lussac

Graham

Newton

Détails de la réponse

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

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Question 16 Rapport

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

dehydration

esterification

fermentation

polymerization

saponification

Détails de la réponse

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

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Question 17 Rapport

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF

Détails de la réponse

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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Question 18 Rapport

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

Carbon

Chlorine

Nitrogen

Phosphorus

Sulphur

Détails de la réponse

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

Non-metals And Their Compounds

Voir la réponse

Question 19 Rapport

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)

Détails de la réponse

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 20 Rapport

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99

uranium235

uranium 238

Détails de la réponse

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

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Question 21 Rapport

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

CH₂

CH₃

C₂H₂

C₂H₄

C₂H₆

Détails de la réponse

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 22 Rapport

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

Détails de la réponse

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

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Question 23 Rapport

The following are ores of metals EXCEPT

bauxite

dolomite

graphite

haematite

magnetite

Détails de la réponse

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 24 Rapport

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron

Magnesium

Sodium

Détails de la réponse

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 25 Rapport

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

Détails de la réponse

Voir la réponse

Question 26 Rapport

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

Boyle’s

Charles’

Dalton’s

Graham’s

Gay Lussac’s

Détails de la réponse

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

Voir la réponse

Question 27 Rapport

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT

PV =KT

V1/T1 = V2/T2

Détails de la réponse

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

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Question 28 Rapport

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

Détails de la réponse

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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Question 29 Rapport

All the following belong to the same family EXCEPT

glycerol

nylon

perspex polyethene

polyethene

polystyrene

Détails de la réponse

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 30 Rapport

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

Détails de la réponse

Read lesson note on Atomic Structure And Bonding (JAMB)

Voir la réponse

Question 31 Rapport

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

Détails de la réponse

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 32 Rapport

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

What is the molar mass of the compound above?

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

180

123

244

Détails de la réponse

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

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Question 33 Rapport

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

The equation above represent a/an

alpha particle emission

endothermic reaction

nuclear fission

nuclear fusion

thermal dissociation

Détails de la réponse

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

Chemical Bonds (Nigeria Only)

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Question 34 Rapport

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

Détails de la réponse

Read lesson note on Atomic Structure And Bonding (JAMB)

Voir la réponse

Question 35 Rapport

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

Détails de la réponse

Read lesson note on Atomic Structure And Bonding (JAMB)

Voir la réponse

Question 36 Rapport

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

alkanal

alkane

alkanoate

alkene

alkyne

Détails de la réponse

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

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Question 37 Rapport

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

NaCl

NaHSO₄

Na₂CO₄

Na₂SO₄

MgCl₂

Détails de la réponse

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

Acids, Bases And Salts

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Question 38 Rapport

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent

fluorescent

hygroscopic

Détails de la réponse

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

Acids, Bases And Salts

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Question 39 Rapport

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

Détails de la réponse

Read lesson note on Electrolysis (JAMB)

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

Electrolysis

Acids, Bases And Salts (Nigeria Only)

Voir la réponse

Question 40 Rapport

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

Détails de la réponse

Read lesson note on Atomic Structure And Bonding (JAMB)

Voir la réponse

Question 41 Rapport

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

Détails de la réponse

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 42 Rapport

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

Carbon (II) oxide

Carbon (IV) oxide

Nitrogen

Noble gases

Oxygen

Détails de la réponse

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

Separation Of Mixtures And Purification Of Chemical Substances

Voir la réponse

Question 43 Rapport

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV)

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

Détails de la réponse

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

Acids, Bases And Salts

Voir la réponse

Question 44 Rapport

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

carbon

crylite

limestone

oxygen

sulphur

Détails de la réponse

Read lesson note on Organic Compounds (JAMB)

Organic Compounds

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Question 45 Rapport

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

Détails de la réponse

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