NECO SSCE - Chemistry - 2001 (Objective)

Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction

I and II only Correct answer

I, II and III only

II and III only

II, II and IV only

III and IV only

Answer Details

Read lesson note on Chemical Kinetics And Equilibrium System (Nigeria Only) (WAEC)

Chemical Kinetics And Equilibrium System (Nigeria Only)

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Question 12 Report

Which compound is a product of the hydrolysis of the of CH₃COOC₃H₇ with aqueous sodium hydroxide?

CH₃COOH Correct answer

CH₃COONaCCH₃OH

CH₃OH

C₂H₅OH

C₃H₇COONa

Answer Details

Read lesson note on Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

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Question 13 Report

Detergents are better than soaps for washing in hard water because

hard water contains insoluble calcium salts.

they contain bleaching powder.

they contain palmitic acid.

they do not form insoluble calcium and magnesium salts. Correct answer

they are organic compounds.

Answer Details

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

Acids, Bases And Salts (Ghana Only)

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Question 14 Report

How much sodium hydroxide is required to nka 250 cm3 ofa0.1 molar solution? Na=23; 0=16; H=1]

10.0 g

4.0g

2.0 g

1 .0g Correct answer

0.1 g

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 15 Report

The position of an element in the Periodic Table is determined by

its atomic radius.

its density.

its relative atomic mass.

the number of protons in its atom. Correct answer

the number of neutrons in its atoms

Answer Details

Read lesson note on Periodic Chemistry (Nigeria Only) (WAEC)

Periodic Chemistry (Nigeria Only)

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Question 16 Report

Fructose and glucose are

allotropes of each other.

both disaccharides

dimere of each other.

isomers of each other Correct answer

isotopes of each other

Answer Details

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

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Chemistry Of Carbon Compounds (Ghana Only)

Separation Of Mixtures And Purification Of Chemical Substances

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Question 17 Report

The decreasing order of the oxidising power of the halogens is

Br>I>Cl>F

F>I>Cl>Br

F>Cl>Br>l Correct answer

I>Br>Cl>F

Cl>Br>F>I

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 18 Report

When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm³ of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.?

164 cm³

168 cm³ Correct answer

179.1.cm³

201.5cm³

546 cm³

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 19 Report

The best way to distinguish between Na₂CO₃and NaHCO₂ is by.

adding an acid.

adding an alkali.

dissolving in water.

exposing to air.

heating. Correct answer

Answer Details

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

Acids, Bases And Salts (Ghana Only)

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Question 20 Report

The oxidation number of X in \(XO_{4}^{3-}\) is

-2

5 Correct answer

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 21 Report

The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to

Becquerel.

Bohr. Correct answer

de Broglie.

Rutherford.

Thompson.

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 22 Report

Which element contains the greatest number of moles?

8 g of Helium

48 g of Carbon Correct answer

78 g of Potassium

130g of Zinc

216g of Sliver

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Read lesson note on Chemical Combination (JAMB)

Metals And Their Compounds

Chemical Combination

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Question 23 Report

An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?

I and II

I and III Correct answer

I and IV

II and III

II and IV

Answer Details

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

Acids, Bases And Salts

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Question 24 Report

A gas X diffuse through porous partition at the rate of 3 cm₃ per second. Under the same condition hydrogen diffused at the rate of 15 cm₃ per second.

What is the 42. relative molecular mass of X.

50 Correct answer

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 25 Report

Which compound is a component of baking powder?

Na₂CO₃

Na₂SO₄

KH₂CO₃

NaHCO₃ Correct answer

NaHSO₄

Answer Details

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

Acids, Bases And Salts

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Question 26 Report

The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is

18 Correct answer

Answer Details

Read lesson note on Structure Of The Atom (Ghana Only) (WAEC)

Read lesson note on Atomic Structure And Bonding (JAMB)

Structure Of The Atom (Ghana Only)

Atomic Structure And Bonding

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Question 27 Report

Faraday s first law of electrolysis can be expressed mathematically as

m=I/it

mαit Correct answer

Q=it

QαI/it

Qαit

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 28 Report

Which metal will dissolve in aqueous sodium hydroxide?

aluminium Correct answer

copper

iron

sikeer

tin

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 29 Report

The Kinetic theory can NOT be used to explain

allotropy. Correct answer

Brownian movement.

diffusion.

Tyndal effect.

vaporization.

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 30 Report

The use of sulphur to vulcanize rubber is mad to make it

blacker.

cheaper. .

more elastic

tougher Correct answer

softer.

Answer Details

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

Acids, Bases And Salts

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Question 31 Report

Which compound can be used as a reducing agent in a reaction?

Cl₂

KMnO₄

KCr₂O₇

MnO₂

Na₂SO₃ Correct answer

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 32 Report

Which statement BEST describes the process of oxidation?

addition of hydrogen

loss of oxygen

decrease in oxidation number

loss of electrons Correct answer

gain of elections.

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 33 Report

The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by

conversion.

elimination.

oxidation. Correct answer

reduction.

substitution.

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 34 Report

what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)

Artificial radioactivity

nuclear fission

nuclear fusion

radio-decomposition

spontaneous disintegration Correct answer

Answer Details

Read lesson note on Structure Of The Atom (WAEC)

Structure Of The Atom

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Question 35 Report

A measure of the degree of disorderliness in a chemical system is known as the

activation energy

enthalpy

entropy Correct answer

equilibrium

free energy.

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 36 Report

20 cm³ of 0.09 mol dm³ solution of tetraoxosuiphate (Vi) acid requires 30cm³ of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23]

0.03 mol dm³

0.12 mol dm³ Correct answer

0.27 mol dm³

0.45 mol dm³

0.90 mol dm³

Answer Details

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

Acids, Bases And Salts

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Question 37 Report

if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is?