NECO SSCE - Chemistry - 2009 (Objective)

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Vraag 3 Verslag

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron Juist antwoord

Magnesium

Sodium

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Lees lesnotitie op Electrolysis (JAMB)

Electrolysis

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Vraag 4 Verslag

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

What is the molar mass of the compound above?

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

180 Juist antwoord

123

244

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Lees lesnotitie op Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

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Vraag 5 Verslag

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

NaCl

NaHSO₄

Na₂CO₄ Juist antwoord

Na₂SO₄

MgCl₂

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Acids, Bases And Salts

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Vraag 6 Verslag

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF Juist antwoord

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Lees lesnotitie op Acids, Bases And Salts (Ghana Only) (WAEC)

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

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Vraag 7 Verslag

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 Juist antwoord

there are equal number of protons and neutrons in its nucleus

there are no elections at the outermost shell

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Vraag 8 Verslag

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent Juist antwoord

fluorescent

hygroscopic

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Acids, Bases And Salts

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Vraag 9 Verslag

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV) Juist antwoord

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

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Acids, Bases And Salts

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Vraag 10 Verslag

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI Juist antwoord

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Energy And Energy Changes

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Vraag 11 Verslag

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

δ G ° =-nFE °

δG °-RT ln K Juist antwoord

δ G °= + RT In k

δG ° = δH – T S

H=TδS

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Vraag 12 Verslag

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

carbon (II) oxide

carbon (IV) oxide Juist antwoord

hydrogen sulphide

nitrogen (II) oxide

oxygen

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Environmental Pollution

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Vraag 13 Verslag

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 Juist antwoord

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Lees lesnotitie op Atomic Structure And Bonding (JAMB)

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Vraag 14 Verslag

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

4 Juist antwoord

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Vraag 15 Verslag

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

Carbon (II) oxide

Carbon (IV) oxide Juist antwoord

Nitrogen

Noble gases

Oxygen

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Separation Of Mixtures And Purification Of Chemical Substances

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Vraag 16 Verslag

All the following belong to the same family EXCEPT

glycerol Juist antwoord

nylon

perspex polyethene

polyethene

polystyrene

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Lees lesnotitie op Periodic Chemistry (Ghana Only) (WAEC)

Chemical Bonds (Ghana Only)

Periodic Chemistry (Ghana Only)

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Vraag 17 Verslag

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

HOCH₂ – CH₂OH Juist antwoord

H₂C –C =C– CH₃

H₃C – HC = CH₂

H₂C = CH₂

H₃C – C =CH

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Acids, Bases And Salts

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Vraag 18 Verslag

Atomic size decreases

across a period from left to right Juist antwoord

across a period from right to left

diagonally down the group

down a group

with decrease in atomic number

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Lees lesnotitie op Periodic Chemistry (Nigeria Only) (WAEC)

Lees lesnotitie op Atomic Structure And Bonding (JAMB)

Lees lesnotitie op 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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Vraag 19 Verslag

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

carbon

crylite

limestone Juist antwoord

oxygen

sulphur

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Organic Compounds

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Vraag 20 Verslag

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃ Juist antwoord

S0₃

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Lees lesnotitie op Water (JAMB)

Lees lesnotitie op Oxidation And Reduction (JAMB)

Water

Oxidation And Reduction

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Vraag 21 Verslag

Which of the following is NOT a fraction of petroleum?

Bitumen

Coal Juist antwoord

Diesel

Kerosene

Petrol

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Solubility Of Substances (Ghana Only)

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Vraag 22 Verslag

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

Carbon

Chlorine Juist antwoord

Nitrogen

Phosphorus

Sulphur

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Non-metals And Their Compounds

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Vraag 23 Verslag

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 Juist antwoord

67.69

76.92

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Vraag 24 Verslag

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine Juist antwoord

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States Of Matter

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Vraag 25 Verslag

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

CH₂

CH₃ Juist antwoord

C₂H₂

C₂H₄

C₂H₆

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Chemical Combination

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Vraag 26 Verslag

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

CH₃ Juist antwoord

CH₄

C₂H₂

C₂H₆

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Separation Of Mixtures And Purification Of Chemical Substances

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Vraag 27 Verslag

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces Juist antwoord

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Lees lesnotitie op Atomic Structure And Bonding (JAMB)

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Vraag 28 Verslag

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Degree of acidity Juist antwoord

Enthalpy change

Equilibrium constant

Ionic product of water

Solubility product

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Lees lesnotitie op Acids, Bases And Salts (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Acids, Bases And Salts (Ghana Only)

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Vraag 29 Verslag

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 Juist antwoord

sulphur, hydrogen

sulphur, oxygen

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Electrolysis

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Vraag 30 Verslag

The Ideal Gas Law is expressed mathematically as

P1 /T1 = P2/T2

P1/V1 = P2V2

PV =nRT Juist antwoord

PV =KT

V1/T1 = V2/T2

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Vraag 31 Verslag

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

nitrogen and carbon (IV) oxide

nitrogen and noble gases Juist antwoord

nitrogen and oxygen

nitrogen, carbon (VI) oxide and noble gases

the noble gases

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Separation Of Mixtures And Purification Of Chemical Substances

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Vraag 32 Verslag

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 Juist antwoord

0.64

3.18

6.35

9.65

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Electrolysis

Acids, Bases And Salts (Nigeria Only)

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Vraag 33 Verslag

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99 Juist antwoord

uranium235

uranium 238

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Vraag 34 Verslag

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 Juist antwoord

reactants occupy a higher energy level

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Rates Of Chemical Reaction

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Vraag 35 Verslag

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

6 Juist antwoord

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Lees lesnotitie op Atomic Structure And Bonding (JAMB)

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Vraag 36 Verslag

Which of the following gases will bleach moist litmus paper?

Cl₂ Juist antwoord

CO₂

HCl

N₂O

SO₃

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Vraag 37 Verslag

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

alkanal

alkane Juist antwoord

alkanoate

alkene

alkyne

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Vraag 38 Verslag

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification Juist antwoord

halogenation

hydrogenation

saponification

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Vraag 39 Verslag

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) Juist antwoord

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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Stoichiometry And Chemical Reactions

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Vraag 40 Verslag

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

ammonia Juist antwoord

carbon(IV)oxide

hydrogen chloride

sulphur (IV) oxide

sulphur (VI) oxide

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Acids, Bases And Salts (Ghana Only)

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Vraag 41 Verslag

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

Brownian Juist antwoord

Dalton

Gay Lussac

Graham

Newton

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