NECO SSCE - Chemistry - 2009 (Objective)

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Question 2 Report

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

δ G ° =-nFE °

δG °-RT ln K Correct answer

δ G °= + RT In k

δG ° = δH – T S

H=TδS

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

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Question 3 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

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

Acids, Bases And Salts

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Question 4 Report

Which of the following is a solid at room temperature?

Argon

Bromine

Chlorine

Fluorine

Iodine Correct answer

Answer Details

Read lesson note on States Of Matter (WAEC)

States Of Matter

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Question 5 Report

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

6 Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 6 Report

Sulphur has an oxidation number of +4 in

H₂S

H₂S0₄

MgSO₄

Na₂SO₃ Correct answer

S0₃

Answer Details

Read lesson note on Water (JAMB)

Read lesson note on Oxidation And Reduction (JAMB)

Water

Oxidation And Reduction

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Question 7 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 8 Report

The reaction of an alkanol with alkanioc acid is known as

dehydration

esterification Correct answer

halogenation

hydrogenation

saponification

Answer Details

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

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Question 9 Report

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

Carbon

Chlorine Correct answer

Nitrogen

Phosphorus

Sulphur

Answer Details

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

Non-metals And Their Compounds

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Question 10 Report

A salt which loses its mass when exposed to air is

deliquescent

effervescent

Efflorescent Correct answer

fluorescent

hygroscopic

Answer Details

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

Acids, Bases And Salts

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Question 11 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)

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Question 12 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

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 13 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

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 14 Report

Which of the following gases will bleach moist litmus paper?

Cl₂ Correct answer

CO₂

HCl

N₂O

SO₃

Answer Details

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

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Question 15 Report

All the following belong to the same family EXCEPT

glycerol Correct answer

nylon

perspex polyethene

polyethene

polystyrene

Answer Details

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 16 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)

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Question 17 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

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 18 Report

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

NaCl

NaHSO₄

Na₂CO₄ Correct answer

Na₂SO₄

MgCl₂

Answer Details

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

Acids, Bases And Salts

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Question 19 Report

Which of the following compounds will undergo thermal dissociation?

AgCl

CaCO₃

K₂S0₄

NaOH

NH₄CI Correct answer

Answer Details

Read lesson note on Energy And Energy Changes (WAEC)

Energy And Energy Changes

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Question 20 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)

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Question 21 Report

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

Co- ordinate Covalent

covalent Correct answer

Electrovalent

Metallic

Van der Waal forces

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

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Question 22 Report

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

carbon

crylite

limestone Correct answer

oxygen

sulphur

Answer Details

Read lesson note on Organic Compounds (JAMB)

Organic Compounds

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Question 23 Report

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

Brownian Correct answer

Dalton

Gay Lussac

Graham

Newton

Answer Details

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

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Question 24 Report

Atomic size decreases

across a period from left to right Correct answer

across a period from right to left

diagonally down the group

down a group

with decrease in atomic number

Answer Details

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 25 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

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 26 Report

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

Boyle’s

Charles’

Dalton’s Correct answer

Graham’s

Gay Lussac’s

Answer Details

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

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Question 27 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

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

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 28 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

Read lesson note on Electrolysis (JAMB)

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

Electrolysis

Acids, Bases And Salts (Nigeria Only)

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Question 29 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

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

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Question 30 Report

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

4 Correct answer

Answer Details

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Question 31 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

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 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

Answer Details

Read lesson note on Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

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Question 33 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

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 34 Report

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

dehydration

esterification

fermentation Correct answer

polymerization

saponification

Answer Details

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

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Question 35 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)