NECO SSCE - Chemistry - 2009 (Objective)

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 Correct answer

2.24

5.6

11.2

Answer Details

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Stoichiometry And Chemical Reactions

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Question 13 Report

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

carbon

crylite

limestone Correct answer

oxygen

sulphur

Answer Details

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Organic Compounds

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Question 14 Report

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) Correct answer

2KCIO₃(s) → 2KCI(s)+ 3O₂(g)

NaH(s) + H₂O(1) → NaOH(aq) +H₂(g)

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

Answer Details

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Stoichiometry And Chemical Reactions

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Question 15 Report

Which of these compounds has the greatest ionic character?

AlF₃

BF₂

CF₄

CsF

NaF Correct answer

Answer Details

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Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

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Question 16 Report

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 Correct answer

there are equal number of protons and neutrons in its nucleus

there are no elections at the outermost shell

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Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 17 Report

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 Correct answer

reactants occupy a higher energy level

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Rates Of Chemical Reaction

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Question 18 Report

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 Correct answer

0.64

3.18

6.35

9.65

Answer Details

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Electrolysis

Acids, Bases And Salts (Nigeria Only)

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Question 19 Report

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

nitrogen and carbon (IV) oxide

nitrogen and noble gases Correct answer

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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Question 20 Report

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

NaCl

NaHSO₄

Na₂CO₄ Correct answer

Na₂SO₄

MgCl₂

Answer Details

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Acids, Bases And Salts

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Question 21 Report

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 Correct answer

hydrogen

metallic

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Atomic Structure And Bonding

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Question 22 Report

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Degree of acidity Correct answer

Enthalpy change

Equilibrium constant

Ionic product of water

Solubility product

Answer Details

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Solubility Of Substances (Ghana Only)

Acids, Bases And Salts (Ghana Only)

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Question 23 Report

Which of the following metals is NOT extracted by electrolysis?

Aluminium

Calcium

iron Correct answer

Magnesium

Sodium

Answer Details

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Electrolysis

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Question 24 Report

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI Correct answer

Answer Details

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Energy And Energy Changes

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Question 25 Report

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

4 Correct answer

Answer Details

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Question 26 Report

The following are ores of metals EXCEPT

bauxite

dolomite

graphite Correct answer

haematite

magnetite

Answer Details

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Metals And Their Compounds

Separation Of Mixtures And Purification Of Chemical Substances

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Question 27 Report

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent Correct answer

fluorescent

hygroscopic

Answer Details

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Acids, Bases And Salts

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Question 28 Report

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

HOCH₂ – CH₂OH Correct answer

H₂C –C =C– CH₃

H₃C – HC = CH₂

H₂C = CH₂

H₃C – C =CH

Answer Details

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Acids, Bases And Salts

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Question 29 Report

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃ Correct answer

S0₃

Answer Details

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Water

Oxidation And Reduction

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Question 30 Report

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 Correct answer

67.69

76.92

Answer Details

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Kinetic Theory Of Matter And Gas Laws

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Question 31 Report

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

CH₃ Correct answer

CH₄

C₂H₂

C₂H₆

Answer Details

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Kinetic Theory Of Matter And Gas Laws

Separation Of Mixtures And Purification Of Chemical Substances

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Question 32 Report

Non-polar molecules are held together by

co-ordinate bond

covalent bond

electromagnetic force

hydrogen bond

Van der Waals forces Correct answer

Answer Details

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Atomic Structure And Bonding

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Question 33 Report

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

6 Correct answer

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Atomic Structure And Bonding

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Question 34 Report

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine Correct answer

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States Of Matter

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Question 35 Report

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

CH₂

CH₃ Correct answer

C₂H₂

C₂H₄

C₂H₆

Answer Details

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Chemical Combination

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Question 36 Report

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

What is the molar mass of the compound above?

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

180 Correct answer

123

244

Answer Details

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 37 Report

Brain tumors can be located by using an isotope of

carbon - 14

iodine 131

technetium 99 Correct answer

uranium235

uranium 238

Answer Details

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 38 Report

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

Carbon

Chlorine Correct answer

Nitrogen

Phosphorus

Sulphur

Answer Details

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Non-metals And Their Compounds

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Question 39 Report

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

Carbon (II) oxide

Carbon (IV) oxide Correct answer

Nitrogen

Noble gases

Oxygen

Answer Details

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 40 Report

Which of the following gases will bleach moist litmus paper?

Cl₂ Correct answer

CO₂

HCl

N₂O

SO₃

Answer Details

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Kinetic Theory Of Matter And Gas Laws

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Question 41 Report

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

Brownian Correct answer

Dalton

Gay Lussac

Graham

Newton

Answer Details

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Kinetic Theory Of Matter And Gas Laws

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Question 42 Report

The following equations represent redox reactions EXCEPT

Ba²⁺(aq) + SO^2-₄ (aq) → BaSO₄(s) Correct answer

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)

Answer Details

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Redox Reactions

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Question 43 Report

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

ammonia Correct answer

carbon(IV)oxide

hydrogen chloride

sulphur (IV) oxide

sulphur (VI) oxide

Answer Details

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

Acids, Bases And Salts (Ghana Only)

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Question 44 Report

The furring of kettles and boilers are caused by

calcium hydroxide

calcium hydrogen trioxocarbonate (IV)

calcium trioxocarbonate (IV) Correct answer

calcium tetraoxocarbonate

magnesium tetraoxocarbonate (VI)

Answer Details

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Acids, Bases And Salts

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Question 45 Report

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

alkanal

alkane Correct answer

alkanoate

alkene

alkyne

Answer Details

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 46 Report

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 Correct answer

sulphur, hydrogen

sulphur, oxygen

Answer Details

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Electrolysis

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Question 47 Report

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 Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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