NECO SSCE - Chemistry - 2009 (Objective)

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Pergunta 4 Relatório

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

alkanal

alkane Resposta correta

alkanoate

alkene

alkyne

Detalhes da Resposta

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Pergunta 5 Relatório

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

δ G ° =-nFE °

δG °-RT ln K Resposta correta

δ G °= + RT In k

δG ° = δH – T S

H=TδS

Detalhes da Resposta

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Pergunta 6 Relatório

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine Resposta correta

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States Of Matter

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Pergunta 7 Relatório

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

Brownian Resposta correta

Dalton

Gay Lussac

Graham

Newton

Detalhes da Resposta

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Pergunta 8 Relatório

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

Boyle’s

Charles’

Dalton’s Resposta correta

Graham’s

Gay Lussac’s

Detalhes da Resposta

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Pergunta 9 Relatório

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

CH₃ Resposta correta

CH₄

C₂H₂

C₂H₆

Detalhes da Resposta

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Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 10 Relatório

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification Resposta correta

halogenation

hydrogenation

saponification

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Pergunta 11 Relatório

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

6 Resposta correta

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Pergunta 12 Relatório

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 Resposta correta

there are equal number of protons and neutrons in its nucleus

there are no elections at the outermost shell

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Pergunta 13 Relatório

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

dehydration

esterification

fermentation Resposta correta

polymerization

saponification

Detalhes da Resposta

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Pergunta 14 Relatório

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

carbon (II) oxide

carbon (IV) oxide Resposta correta

hydrogen sulphide

nitrogen (II) oxide

oxygen

Detalhes da Resposta

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Environmental Pollution

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Pergunta 15 Relatório

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

Carbon

Chlorine Resposta correta

Nitrogen

Phosphorus

Sulphur

Detalhes da Resposta

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Non-metals And Their Compounds

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Pergunta 16 Relatório

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 Resposta correta

2.24

5.6

11.2

Detalhes da Resposta

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Stoichiometry And Chemical Reactions

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Pergunta 17 Relatório

Which of the following is NOT a fraction of petroleum?

Bitumen

Coal Resposta correta

Diesel

Kerosene

Petrol

Detalhes da Resposta

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Solubility Of Substances (Ghana Only)

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Pergunta 18 Relatório

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) Resposta correta

2KCIO₃(s) → 2KCI(s)+ 3O₂(g)

NaH(s) + H₂O(1) → NaOH(aq) +H₂(g)

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

Detalhes da Resposta

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Stoichiometry And Chemical Reactions

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Pergunta 19 Relatório

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

What is the molar mass of the compound above?

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

180 Resposta correta

123

244

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Pergunta 20 Relatório

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

HOCH₂ – CH₂OH Resposta correta

H₂C –C =C– CH₃

H₃C – HC = CH₂

H₂C = CH₂

H₃C – C =CH

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 21 Relatório

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

Co- ordinate Covalent

covalent Resposta correta

Electrovalent

Metallic

Van der Waal forces

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Pergunta 22 Relatório

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Degree of acidity Resposta correta

Enthalpy change

Equilibrium constant

Ionic product of water

Solubility product

Detalhes da Resposta

Ler a nota de aula em Solubility Of Substances (Ghana Only) (WAEC)

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Solubility Of Substances (Ghana Only)

Acids, Bases And Salts (Ghana Only)

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Pergunta 23 Relatório

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 Resposta correta

hydrogen

metallic

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Pergunta 24 Relatório

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

CH₂

CH₃ Resposta correta

C₂H₂

C₂H₄

C₂H₆

Detalhes da Resposta

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Chemical Combination

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Pergunta 25 Relatório

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

ammonia Resposta correta

carbon(IV)oxide

hydrogen chloride

sulphur (IV) oxide

sulphur (VI) oxide

Detalhes da Resposta

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Acids, Bases And Salts (Ghana Only)

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Pergunta 26 Relatório

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT Resposta correta

PV =KT

V1/T1 = V2/T2

Detalhes da Resposta

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Pergunta 27 Relatório

Which of the following gases will bleach moist litmus paper?

Cl₂ Resposta correta

CO₂

HCl

N₂O

SO₃

Detalhes da Resposta

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Pergunta 28 Relatório

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃ Resposta correta

S0₃

Detalhes da Resposta

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Water

Oxidation And Reduction

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Pergunta 29 Relatório

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 Resposta correta

reactants occupy a higher energy level

Detalhes da Resposta

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Rates Of Chemical Reaction

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Pergunta 30 Relatório

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI Resposta correta

Detalhes da Resposta

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Energy And Energy Changes

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Pergunta 31 Relatório

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

Carbon (II) oxide

Carbon (IV) oxide Resposta correta

Nitrogen

Noble gases

Oxygen

Detalhes da Resposta

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Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 32 Relatório

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent Resposta correta

fluorescent

hygroscopic

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 33 Relatório

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

The equation above represent a/an

alpha particle emission

endothermic reaction

nuclear fission Resposta correta

nuclear fusion

thermal dissociation

Detalhes da Resposta

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Chemical Bonds (Nigeria Only)

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Pergunta 34 Relatório

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV) Resposta correta

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 35 Relatório

All the following belong to the same family EXCEPT

glycerol Resposta correta

nylon

perspex polyethene

polyethene

polystyrene

Detalhes da Resposta

Ler a nota de aula em Chemical Bonds (Ghana Only) (WAEC)

Ler a nota de aula em Periodic Chemistry (Ghana Only) (WAEC)

Chemical Bonds (Ghana Only)

Periodic Chemistry (Ghana Only)

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Pergunta 36 Relatório

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

nitrogen and carbon (IV) oxide

nitrogen and noble gases Resposta correta

nitrogen and oxygen

nitrogen, carbon (VI) oxide and noble gases

the noble gases

Detalhes da Resposta

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Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 37 Relatório

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces Resposta correta

Detalhes da Resposta

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Pergunta 38 Relatório

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

NaCl

NaHSO₄

Na₂CO₄ Resposta correta

Na₂SO₄

MgCl₂

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 39 Relatório

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF Resposta correta

Detalhes da Resposta

Ler a nota de aula em Oxidation And Reduction (JAMB)

Ler a nota de aula em Acids, Bases And Salts (Ghana Only) (WAEC)

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

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Pergunta 40 Relatório

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 Resposta correta

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Pergunta 41 Relatório

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99 Resposta correta

uranium235

uranium 238

Detalhes da Resposta

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Pergunta 42 Relatório

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 Resposta correta

sulphur, hydrogen

sulphur, oxygen

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Electrolysis

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Pergunta 43 Relatório

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

4 Resposta correta

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Pergunta 44 Relatório

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron Resposta correta

Magnesium

Sodium

Detalhes da Resposta

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Electrolysis

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Pergunta 45 Relatório

The following equations represent redox reactions EXCEPT

Ba²⁺(aq) + SO^2-₄ (aq) → BaSO₄(s) Resposta correta

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)

Detalhes da Resposta

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Redox Reactions

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Pergunta 46 Relatório

Atomic size decreases

across a period from left to right Resposta correta

across a period from right to left

diagonally down the group

down a group

with decrease in atomic number

Detalhes da Resposta

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Ler a nota de aula em Chemical Industry And Environment (WAEC)

Ler a nota de aula em Periodic Chemistry (Nigeria Only) (WAEC)

Ler a nota de aula em Atomic Structure And Bonding (JAMB)

Ler a nota de aula em 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)