NECO SSCE - Chemistry - 2009 (Objective)

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Frage 2 Bericht

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 Richtige Antwort

reactants occupy a higher energy level

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Lies die Unterrichtsnotiz zu Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Frage 3 Bericht

Atomic size decreases

across a period from left to right Richtige Antwort

across a period from right to left

diagonally down the group

down a group

with decrease in atomic number

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Lies die Unterrichtsnotiz zu Structure Of The Atom (Ghana Only) (WAEC)

Lies die Unterrichtsnotiz zu Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Lies die Unterrichtsnotiz zu Chemical Industry And Environment (WAEC)

Lies die Unterrichtsnotiz zu Periodic Chemistry (Nigeria Only) (WAEC)

Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)

Lies die Unterrichtsnotiz zu 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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Frage 4 Bericht

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 Richtige Antwort

67.69

76.92

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 5 Bericht

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

6 Richtige Antwort

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)

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Frage 6 Bericht

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 Richtige Antwort

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)

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Frage 7 Bericht

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

Carbon

Chlorine Richtige Antwort

Nitrogen

Phosphorus

Sulphur

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Lies die Unterrichtsnotiz zu Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

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Frage 8 Bericht

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT Richtige Antwort

PV =KT

V1/T1 = V2/T2

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 9 Bericht

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

alkanal

alkane Richtige Antwort

alkanoate

alkene

alkyne

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Lies die Unterrichtsnotiz zu Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Frage 10 Bericht

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

ammonia Richtige Antwort

carbon(IV)oxide

hydrogen chloride

sulphur (IV) oxide

sulphur (VI) oxide

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Lies die Unterrichtsnotiz zu Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

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Frage 11 Bericht

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

Carbon (II) oxide

Carbon (IV) oxide Richtige Antwort

Nitrogen

Noble gases

Oxygen

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Lies die Unterrichtsnotiz zu Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Frage 12 Bericht

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 Richtige Antwort

hydrogen

metallic

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)

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Frage 13 Bericht

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 Richtige Antwort

sulphur, hydrogen

sulphur, oxygen

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Lies die Unterrichtsnotiz zu Electrolysis (JAMB)

Electrolysis

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Frage 14 Bericht

The following equations represent redox reactions EXCEPT

Ba²⁺(aq) + SO^2-₄ (aq) → BaSO₄(s) Richtige Antwort

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)

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Lies die Unterrichtsnotiz zu Redox Reactions (WAEC)

Redox Reactions

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Frage 15 Bericht

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

δ G ° =-nFE °

δG °-RT ln K Richtige Antwort

δ G °= + RT In k

δG ° = δH – T S

H=TδS

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 16 Bericht

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

Boyle’s

Charles’

Dalton’s Richtige Antwort

Graham’s

Gay Lussac’s

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 17 Bericht

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification Richtige Antwort

halogenation

hydrogenation

saponification

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Lies die Unterrichtsnotiz zu Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Frage 18 Bericht

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

dehydration

esterification

fermentation Richtige Antwort

polymerization

saponification

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Lies die Unterrichtsnotiz zu Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Frage 19 Bericht

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

4 Richtige Antwort

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Frage 20 Bericht

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 Richtige Antwort

2.24

5.6

11.2

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Lies die Unterrichtsnotiz zu Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Frage 21 Bericht

All the following belong to the same family EXCEPT

glycerol Richtige Antwort

nylon

perspex polyethene

polyethene

polystyrene

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Lies die Unterrichtsnotiz zu Chemical Bonds (Ghana Only) (WAEC)

Lies die Unterrichtsnotiz zu Periodic Chemistry (Ghana Only) (WAEC)

Chemical Bonds (Ghana Only)

Periodic Chemistry (Ghana Only)

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Frage 22 Bericht

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent Richtige Antwort

fluorescent

hygroscopic

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Lies die Unterrichtsnotiz zu Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Frage 23 Bericht

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) Richtige Antwort

2KCIO₃(s) → 2KCI(s)+ 3O₂(g)

NaH(s) + H₂O(1) → NaOH(aq) +H₂(g)

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

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Lies die Unterrichtsnotiz zu Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Frage 24 Bericht

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

The equation above represent a/an

alpha particle emission

endothermic reaction

nuclear fission Richtige Antwort

nuclear fusion

thermal dissociation

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Lies die Unterrichtsnotiz zu Chemical Bonds (Nigeria Only) (WAEC)

Chemical Bonds (Nigeria Only)

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Frage 25 Bericht

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine Richtige Antwort

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Lies die Unterrichtsnotiz zu States Of Matter (WAEC)

States Of Matter

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Frage 26 Bericht

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃ Richtige Antwort

S0₃

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Lies die Unterrichtsnotiz zu Water (JAMB)

Lies die Unterrichtsnotiz zu Oxidation And Reduction (JAMB)

Water

Oxidation And Reduction

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Frage 27 Bericht

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF Richtige Antwort

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Lies die Unterrichtsnotiz zu Oxidation And Reduction (JAMB)

Lies die Unterrichtsnotiz zu Acids, Bases And Salts (Ghana Only) (WAEC)

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

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Frage 28 Bericht

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI Richtige Antwort

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Lies die Unterrichtsnotiz zu Energy And Energy Changes (WAEC)

Energy And Energy Changes

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Frage 29 Bericht

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

Brownian Richtige Antwort

Dalton

Gay Lussac

Graham

Newton

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 30 Bericht

Which of the following gases will bleach moist litmus paper?

Cl₂ Richtige Antwort

CO₂

HCl

N₂O

SO₃

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

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Frage 31 Bericht

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

Co- ordinate Covalent

covalent Richtige Antwort

Electrovalent

Metallic

Van der Waal forces

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)

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Frage 32 Bericht

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV) Richtige Antwort

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

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Lies die Unterrichtsnotiz zu Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Frage 33 Bericht

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

nitrogen and carbon (IV) oxide

nitrogen and noble gases Richtige Antwort

nitrogen and oxygen

nitrogen, carbon (VI) oxide and noble gases

the noble gases

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Lies die Unterrichtsnotiz zu Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Frage 34 Bericht

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

What is the molar mass of the compound above?

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

180 Richtige Antwort

123

244

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Lies die Unterrichtsnotiz zu Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Frage 35 Bericht

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

CH₃ Richtige Antwort

CH₄

C₂H₂

C₂H₆

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Lies die Unterrichtsnotiz zu Kinetic Theory Of Matter And Gas Laws (JAMB)

Lies die Unterrichtsnotiz zu Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Frage 36 Bericht

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron Richtige Antwort

Magnesium

Sodium

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Lies die Unterrichtsnotiz zu Electrolysis (JAMB)

Electrolysis

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Frage 37 Bericht

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

carbon

crylite

limestone Richtige Antwort

oxygen

sulphur

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Lies die Unterrichtsnotiz zu Organic Compounds (JAMB)

Organic Compounds

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Frage 38 Bericht

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 Richtige Antwort

there are equal number of protons and neutrons in its nucleus

there are no elections at the outermost shell

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)

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Frage 39 Bericht

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces Richtige Antwort

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Lies die Unterrichtsnotiz zu Atomic Structure And Bonding (JAMB)