JAMB CHEMISTRY PAST QUESTIONS

JAMB CHEMISTRY PAST QUESTIONS

JAMB CHEMISTRY PAST QUESTIONS

Attempt all 60 questions picked from our pool past questions. You have 1 hour to answer all 60 questions.

You can retake the exam again and again

Goodluck

1 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The enzyme used in the hydrolysis of starch to dextrin and maltose is

invertase

diastatse

amylase

zymase

2 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following statements about catalyst is false?

catalysts do not alter the mechanism of the reaction and never appear in the rate low

biological catalysts are called enzymes

catalyst do not appear in the balanced equation

catalyst reduce the activation energy for a reaction

3 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)?

Filtration

Evaporation

Fractional distillation

Fractional crystallization

4 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The elements that belong to the third period of periodic table are

Li, Be, Al and D

B, C, N, and O

N2, Mg, S and Ar

Na, P, O and Cl

5 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The gas that is most useful in protecting humans against solar marathon is

ozone

hydrogen sulphur

carbon IV oxide

chlorine

6 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

An element used in the production of matches is

nitrogen

aluminium

copper

sulphur

7 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?

chlorine attacks the iodide ion to give the blue-black color

chlorine attacks the starch to give the blue-black color

chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color

iodine attacks the starch to give the blue-black color

8 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The shape of ammonia molecules is

square planar

tetrahedral

octahedral

trigonal planar

9 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays

travel in straight lines

have mass

are negatively charged

are positively charged

10 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The elements in the periodic table are listed in order of increasing

relative atomic number

nuclear charge

relative isotopic mass

atomic mass

11 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The principle of column chromatography is based on th ability of the constituents to

Dissolve in each other in the column

Move at different speeds in the column

React with each other in the solvent in the column

React with the solvent in the column

12 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A second alkanol can be oxidized to give an

alkyne

alkanoic acid

alkanal

alkanone

13 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

co-ordinate bond

electrovalent bond

ionic bond

covalent bond

14 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A small quantity of solid ammonium chloride (NH4Cl) texted gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit was absence on the cooler part of the test tube. The ammonium chloride is to have undergo

precipitation

sublimation

evaporation

distillation

15 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

In the industrial production of H₂ is removed by (solution)

passing the mixture to the limewater

drying over phosphorus (V) oxide

using ammonical copper (I) chlorine

washing under pressure

16 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following metals cannot replace hydrogen from water or steam?

Magnesium

Iron

Calcium

Sodium

17 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is

Iodine-131

Cobalt-60

Carbon-14

Phosphorus-32

18 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The constituent common to duralumin and alnico is

Co

Mg

Al

Mn

19 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following represents the kind of bonding present in ammonium chloride?

ionic only

covalent only

ionic and dative covalent

dative covalent

20 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Hydrogen can be displaced from a lot alkaline solution by

Cn

Sn

Fe

Cu

21 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density.

49

106

196

82

22 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following statements is correct about the periodic table?

Elements in the same group have the same number of electron shells

The non-metallic Properties of the elements tend to decrease across each period

Elements in the same period have the same number of valence electrons

The valence electrons of the elements in the same period increase progressively across the period

23 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Tartaric acid is used industrially to

dry substance

make fruit juice

make baking powder

remove rust

24 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

An oxidation state of or in K2CrO7

5

7

6

4

25 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The ideal gas laws and equations are true for all gases at

low pressures and lower temperatures

high pressures and high temperatures

low pressure and high temperatures

low temperatures and high pressures

26 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of these alloys contains copper?

steel

solder

bronze

permallory

27 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Aluminium hydroxide is used in the dyeing industry as a

salt

dispersant

mordant

dye

28 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Flow of current in electrolytes is due to the movement of

Charges

Ions

Electrons

holes and electron

29 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The reaction of halogens in the presence of sunlight is an example of

hydrogenation reaction

addition reaction

oxidation reaction

substitution reaction

30 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The filter in the cigarette reduce the nicotine construct by

burning

absorption

evaporation

absorption

31 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The process that occurs when two equivalent forms of a compound are in equilibrium is

Resonance

Isotopy

Isomerism

Reforming

32 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The process that requires the use of hardwater in its operation is

Laundry

Dyeing

Bottling

Tanning

33 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The ability of carbon to form long chains is referred to as

Acylation

Carbonation

Catenation

Alkylation

34 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The colour of litmus in an alkaline medium is

Yellow

Pink

Blue

Red

35 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

Q will form a covalent bond with S

R will form an electrovalent bond with S

Q will form an electrovalent bond with S

P will form an electrovalent bond with R

36 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The ionic radii of metals are usually

unaffected by the charge on the ion

greater than their atomic radii

the same as their atomic radii

less than their atomic radii

37 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Atomicity of ozone is

2

1

4

3

38 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Iron is often galvanized in order to

Protect it against corrosion

Render it passive

Remove the impurities unit

Make it more malleable

39 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The shape of the S-orbital is

spiral

elliptical

spherical

circular

40 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is

Blue

Orange

Purple

Red

41 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

In the discovery of protein, the instrument used is

glass tube and discharge tube

cathode ray tube

discharge tube with central cathode

discharge tube with terminal cathode

42 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following statements is true about 2-methylpropane and butane

They have the same boiling points

They have the same chemical properties

They have different number of carbon atoms

They are members of same homologous series

43 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A substance that is used as a ripening agent for fruits is

methane

ethene

propane

butane

44 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The energy value of petrol can be determined by

Fractionating column

Catalytic cracker

Thermometer

Bomb calorimeter

45 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following types of alkanols undergo oxidation to produce alkanoic acids.

I. Primary alkanols
II. Secondary alkanols
III. Tertiary alkanols

I, II and III

I and II only

III only

I only

46 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following metals is the most essential in the regulation of blood volume, blood pressure and osmotic equilibrium?

Iron

Zinc

Sodium

Manganese

47 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following will give a precipitate with an aqueous solution of copper (I) chloride?

But-2-yne

But-1-yne

But-1-ene

But-2-ene

48 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The compounds CH₃CH₂CHO and CH₃COCH₃ can be distinguished from each other using

Benedict's solution

Sodium hydroxide solution

Dilute ammonia

Tollen's reagent

49 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

2-methylprop-1-ene is an isomer of

3-methyl but-1-ene

pent-2-ene

but-2-ene

2-methyl but-1-ene

50 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The metal whose ore can be concentrated by passing it through a magnetic separator is

Ca

Sn

Cn

Zn

51 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

degradation

disintegration

cracking

polymerization

52 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The situation obtained when a perfect gas expands into a vacuum is

ΔH is positive and T Δ S is negative

ΔH is zero and T Δ S is positive

ΔH is positive and TΔ S is zero

ΔH is negative and TΔ S is zero

53 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

When ΔH is negative, a reaction is said to be

exothermic

reversible

ionic

endothermic

54 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

What is the percentage of sulphur in sulphur (IV) oxide?

50%

25%

40%

66%

55 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

In the production of soap, concentrated sodium chloride solution is added to

emulsify the soap

increase the solubility of soap

saponify the soap

decrease the solubility of the soap

56 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Sieving is a technique used to separate mixtures containing solid particles of

small sizes

large sizes

different sizes

the same size

57 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following alkaline metals react more quickly spontaneously with water?

Beryllium

Strontium

Magnesium

Calcium

58 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

There are basic particles from which matter called be made except

Salt

Atom

Ion

Molecule

59 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following statements is correct about the periodic table?Which of the following statements is correct about the periodic table?

The non-metallic properties of the elements tend to decrease across each period

The valence electrons of the elements increase progressively across the period

Elements in the same group have the same number of electron shells

Elements in the same period have the same number of valence electrons

60 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The periodic classification is an arrangement of the elements

atomic numbers

molecular weights

atomic weights

isotopic weights

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