CHEMISTRY PAST QUESTIONS

SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS)

CHEMISTRY PAST QUESTIONS

Attempt all 60 questions that are selected from the Chemistry question bank. Use the NEXT, PREV, CLEAR and FINISH buttons to navigate around the CBT.

You have 1 hour to answer all 60 questions.

Goodluck

1 / 60

Category: CHEMISTRY PAST QUESTIONS

Consider the reaction represented by the following equation: H_2(g) + 1_2(g) → 2HI_(g). The number of effective collisions of molecules of the reactants decreases as

the pressure increased

the temperature is raised

the volume of the system is increased

a catalysty is intoduced into the system

2 / 60

Category: CHEMISTRY PAST QUESTIONS

What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO₃?

Dehydration

Destructive distillation

Nutralization

Redox reaction

3 / 60

Category: CHEMISTRY PAST QUESTIONS

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

Carbon

Sulphur

Chlorine

Nitrogen

4 / 60

Category: CHEMISTRY PAST QUESTIONS

The crystal layers in graphite are held together by

van der Waals' forces

electrostatic forces

hydrogen bonds

covalent bonds

5 / 60

Category: CHEMISTRY PAST QUESTIONS

Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?

R + P+ → P + R+

Q + S+ → S + Q+

S + Q+ → Q + S+

S + P+ → P + S +

6 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following increases as boiling water changes to steam?

number of molecules

degree of disorder in the system

activation energy

temperature of the system

7 / 60

Category: CHEMISTRY PAST QUESTIONS

It can be concluded that gastric juice

has pH value of 7

is a mixture

contains enzymes

is acidic

8 / 60

Category: CHEMISTRY PAST QUESTIONS

What is oxidized in the reaction represented by the following equation? 3CU + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O

Hydrogen

Nitrogen

Oxygen

Copper

9 / 60

Category: CHEMISTRY PAST QUESTIONS

The liquid product of the destructive distillation of coal is

ammoniacal liquor

kerosene

paraffin oil

ethanol

10 / 60

Category: CHEMISTRY PAST QUESTIONS

Petrol consists mainly of

alktanols

polymers

hydrocarbons

alkanoates

11 / 60

Category: CHEMISTRY PAST QUESTIONS

An exothermic reaction is one which involves

evolution of gas as it proceeds

attainment of dynamic equilibrium

loss of heat to the surrounding

positive change in value of enthalpy

12 / 60

Category: CHEMISTRY PAST QUESTIONS

0.10 mol dm^-3 NaCI conducts electricity better than 0.10 mol dm^-3 CH₃COOH because the solution of NaCI

has a lower molar mass

is neutral to litmus

contains more ions

has a higher pH

13 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following methods is suitable for the preparation of an insoluble salt?

Action of an acid on a trioxocarbonate (IV)

Action of an acid on a metal

Double decomposition

Neutralisation

14 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following properties increases down a group in the Periodic Table?

Electronegativity

Atomic radius

Electon affinity

Ionization energy

15 / 60

Category: CHEMISTRY PAST QUESTIONS

Electrovalent compounds are characterized by

high melting point

high molar mass

solubility in ethanol

strong oxidizing ability

16 / 60

Category: CHEMISTRY PAST QUESTIONS

In the Periodic Table, the elements that loss electrons most readily belong to

Group 1 A

Group 11 A

Group V11 A

Group 111 A

17 / 60

Category: CHEMISTRY PAST QUESTIONS

What is responsible for metallic bonding?

transfer of electrons from one atom to another

Sharing of electrons between the metal atoms

Attraction between positive and negative ions

Attraction between the atomic unclei and cloud of electrons

18 / 60

Category: CHEMISTRY PAST QUESTIONS

When alkanols react with sodium, the ga evolved is

oxygen

ethyne

hydrogen

methane

19 / 60

Category: CHEMISTRY PAST QUESTIONS

Substances which absorb water from the atmosphere without dissolving in it are said to be

insolube

hydrated

hygroscopic

anhydrous

20 / 60

Category: CHEMISTRY PAST QUESTIONS

A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by

filtration

evaporation

sublimation

distillation

21 / 60

Category: CHEMISTRY PAST QUESTIONS

What is the value of x in the following equation? Cr₂O₇^2- + 14H⁺ + xe- → 2Cr³⁺ + 7H₂O

8

6

1

12

22 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following compounds dissolves in water to form a solution with pH below 7?

Ammonium chloride

Sodium tetraoxosulphate (VI)

Sodium trioxocarbonate (IV)

Potassium hydroxide

23 / 60

Category: CHEMISTRY PAST QUESTIONS

A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of

alpha particles and gamma rays

alpha and beta particles

beta particles and gamma rays

alpha particles only

24 / 60

Category: CHEMISTRY PAST QUESTIONS

The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is

sulphur (VI) oxide

carbon (IV) oxide

hydrogen

oxygen

25 / 60

Category: CHEMISTRY PAST QUESTIONS

Helium is preferred to hydrogen in filling balloons because hydrogen

exhibits isotopy

is a component of water

is diatomic

is inflammable

26 / 60

Category: CHEMISTRY PAST QUESTIONS

How many electrons are removed from Cr^2- when it is oxidized to CrO₄^2-?

8

2

4

0

27 / 60

Category: CHEMISTRY PAST QUESTIONS

One mole of a compound M(HCO₃)₂ has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]

53

40

122

101

28 / 60

Category: CHEMISTRY PAST QUESTIONS

Dehydration of ethanol produces

ethanoic acid

propan-1,2,3-triol

ethene

ethanal

29 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?

4d

4f

4s

4p

30 / 60

Category: CHEMISTRY PAST QUESTIONS

If the solubility of KHCO₃ is 0.40 mole dm^-3

10.0g

4.0g

100.0g

40.0g

31 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following would dissolve in warm dilute H₂SO₄ without effervescence, to give a blue solution?

Copper turnings

Copper (ll) trioxocarbonate (IV)

Copper (ll) oxide

Copper alloy

32 / 60

Category: CHEMISTRY PAST QUESTIONS

Equal volumes of CO₂ cnd CO at s.t.p have the same

number of molecules

rate of diffusion

mass

density

33 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following contains co-ordinate covalent bond?

Na+CI

CH4

HCI

NH4

34 / 60

Category: CHEMISTRY PAST QUESTIONS

The property of calcium chloride which makes it useful as a drying agent is that it is

ionic

deliquescent

a strong electrolyte

a normal salt

35 / 60

Category: CHEMISTRY PAST QUESTIONS

Elements which belong to the same group in the Periodic Table are characterized by

difference of 14 atomic mass units between successive members

presence of the same number of electron shells in the respective atoms

presence of the same number of outermost electrons in the respective atoms

difference of +1 in the oxidation numbers of successive members

36 / 60

Category: CHEMISTRY PAST QUESTIONS

What is the oxidation number of nitrogen in AI(NO₃)₃?

+ 1

+ 6

+ 5

+ 3

37 / 60

Category: CHEMISTRY PAST QUESTIONS

Consider the following equation: Ag⁺ _(aq) + CI-_(aq) → Ag⁺CI- _(s) ; ∆H = _65.7 kJmol^-1. From the equation, it can be deduced that

the reaction is endothermic and occurs at high temperature

direct combination is involved and the reaction is endothermic

a solid is formed and heat is evolved

activation energy is high and a catalyst is required

38 / 60

Category: CHEMISTRY PAST QUESTIONS

What will be the effect of increase in pressure on the following system at equilibrium? 2NH_2(g) N_2(g) + 3H_2(g)

the forward reaction will be favoured

Activation energy will decrease

the reaction will go to completion

the concentration of ammonia will increase

39 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following can undergo both addition reactions and substitution reactions?

Hexane

Propene

Benzene

Pentane

40 / 60

Category: CHEMISTRY PAST QUESTIONS

What does ∆H represent in the following equation ? Cl_(g) + e- → CI- _(g); ∆H = - 363 kJ mol-¹

Electron affinity

Dissociation energy

Heat of atomization

lonization energy

41 / 60

Category: CHEMISTRY PAST QUESTIONS

A radioactive solid is best stored

in a box lined with lead

under paraffin oil

under ultraviolet light

in a cool, dark cupboard

42 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following statements about ideal gases is/are correct?

I. The cohesive forces between their particles are negligible

ll. The have no definite volume but occupy the volume of their containers

III. They are not compressible

IV. Their particles collide with loss of energy

l, ll and lll only

l and ll only

l only

l, ll, lll, and IV

43 / 60

Category: CHEMISTRY PAST QUESTIONS

Elactrostatic force of attraction between sodium ion and halide ion is greatest in

NaI

NaF

NaCI

NaBr

44 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following will displace copper from a solution of copper (ll) salt?

Silver

Aluminium ions

Magnesium

Zinc ions

45 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following features of a human skeleton can be determined by carbon-dating?

Age

Mass

Race

Height

46 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?

Dilute sodium chloride solution

Glucose solution

Concentrated hydrochloric acid

Aqueous copper (ll) tetraoxosulphate (IV)

47 / 60

Category: CHEMISTRY PAST QUESTIONS

P _Total = F₁ + P₂ + P ₃ + .........P_n' where P _Total is the pressure of a mixture of gasses. The equation above is an expression of

Boyle's law

Dalton's law

Graham's law

Gay-Lussac's Law

48 / 60

Category: CHEMISTRY PAST QUESTIONS

Which of the following compounds dissolves in water to give an alkaline solution?

Sodium chloride

Potassium oxide

Ammonium chloride

Sulphur (IV) oxide

49 / 60

Category: CHEMISTRY PAST QUESTIONS

The spontaneity of a chemical reaction is determined by the change in the

concentration of the reactants

pressure applied to the system

free energy of the system

temperature of the system

50 / 60

Category: CHEMISTRY PAST QUESTIONS

What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]

18g

0.318g

0.635g

6.35g

51 / 60

Category: CHEMISTRY PAST QUESTIONS

Metals are said to be malleable because they

are good conductors of electricity

are good conductors heat

can be beaten into sheets

can be alloyed

52 / 60

Category: CHEMISTRY PAST QUESTIONS

A reaction is represented by the equation below. A_2(g) + B_2(g) 2AB_(g); ∆H = +X kJmol^-1 Which of the following statements about the system is correct?

The reaction goes to completion at equilibrium

Pressure has no effect on the equilibrium mixture

The forward reaction is exthermic

At equilibrium increase in temperature favours the reverse reaction

53 / 60

Category: CHEMISTRY PAST QUESTIONS

If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly

metallic

ionic

covalent

dative

54 / 60

Category: CHEMISTRY PAST QUESTIONS

The type of chemical bond that exists between potassium and oxygen in potassium oxide is

dative

metallic

ionic

covalent

55 / 60

Category: CHEMISTRY PAST QUESTIONS

Pauli Exclusion Principle is related to

reversiblility of equlibrium reactions

quantum numbers of electrons

collision theory of reaction rates

electronegativity values of elements

56 / 60

Category: CHEMISTRY PAST QUESTIONS

A concentrated solution containing H⁺, Cu²⁺,OH^- and CI^- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?

Cu2+

OH-

CI-

H+

57 / 60

Category: CHEMISTRY PAST QUESTIONS

What is the shape of a molecule of CCI₄?

Trigonal planar

Linear

Tetrahedral

Pyramidal

58 / 60

Category: CHEMISTRY PAST QUESTIONS

What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn_(s) + 2HCI_(aq) → ZnCI _2(aq) + H_2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm³ at s.t.p]

0.896dm 3

0.040dm 3

8.62dm 3

5.82dm 3

59 / 60

Category: CHEMISTRY PAST QUESTIONS

What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO _2(aq) + 2H₂S_(g) → 3S _(s) + 2H ₂O _(l)

Bleaching agent

Oxidising agent

Dehydrating agent

Acid

60 / 60

Category: CHEMISTRY PAST QUESTIONS

Chlorine atom forms CI by

Sharing one electron

Donating lone pair of electrons

Losing one electron

Gaining one electron

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