JAMB CHEMISTRY PAST QUESTIONS School Portal NG

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.

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1 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The above orbital diagram shown the electronic configuration of

nitrogen

chlorine

calcium

neon

2 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the noble gases has the greatest ionization energy

He

Ar

Rr

Xe

3 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

saponify the soap

decrease the solubility of the soap

increase the solubility of soap

emulsify the soap

4 / 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

disintegration

cracking

degradation

polymerization

5 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

electrovalent bond

co-ordinate bond

ionic bond

covalent bond

6 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

invertase

amylase

diastatse

zymase

7 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

the same size

small sizes

large sizes

different sizes

8 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A mixture is different from a compound because

the properties of a compound are those of its individual constituents while those of a mixture differ from its constituents

a mixture is always homogeneous while a compound is not

a mixture can be represented by a chemical formula while a compound cannot

the constituent of a compound are chemically bound together while those of a mixture are not

9 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following is an example of a chemical change?

rusting of iron

separating a mixture by distillation

melting of ice

dissolution of salt in water

10 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

covalent only

dative covalent

ionic only

ionic and dative covalent

11 / 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?

Zinc

Iron

Sodium

Manganese

12 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Zn

Cn

Sn

Ca

13 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A suitable reagent for distinguish between ethanoic and ethanol is

sodium hydrogen trioxocarbonate (iv)

ammoniacal silver trioxonitrate(V)

bromine water

fehling’s solution

14 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

nuclear charge

relative isotopic mass

atomic mass

relative atomic number

15 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]

48

16

40

12

16 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The periodic classification is an arrangement of the elements

isotopic weights

atomic numbers

atomic weights

molecular weights

17 / 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

18 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following metals burns with brick red

Na

Ca

Mg

Pb

19 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The number of isomers formed by C₆H₁₄ is

4

5

3

2

20 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The energy value of petrol can be determined by

Thermometer

Bomb calorimeter

Fractionating column

Catalytic cracker

21 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Tin is unaffected by air at ordinary temperature due to its

Weak electropositive character

Low melting point

White lustrous appearance

High boiling point

22 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Carbonation

Alkylation

Catenation

Acylation

23 / 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

sublimation

evaporation

distillation

precipitation

24 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

In the discovery of protein, the instrument used is

discharge tube with terminal cathode

cathode ray tube

discharge tube with central cathode

glass tube and discharge tube

25 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Ethanol is soluble in water due to the presence of a

Methyl group

Phenyl group

Hydroxyl group

Carbonyl group

26 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A second alkanol can be oxidized to give an

alkanone

alkanal

alkanoic acid

alkyne

27 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following is the best starting material for the preparation of oxygen? Heating of trioxonitrate (v) with

Pb

Na

Zn

Ca

28 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Calculate the amount in moles of silver deposited when 9650C of electricty is passed through a solution of silver salt [= 96500 Cmol^-1]

0.05

10.00

10.80

0.10

29 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Iron is often galvanized in order to

Render it passive

Protect it against corrosion

Make it more malleable

Remove the impurities unit

30 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Ammonium chloride can be separated from its mixture with common salt by

Sublimation

Evaporation

Distillation

Decantation

31 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Rare gases are suitable because they

are volatile gases

form ions easily

have duplet or octet electronic configuration in the outermost shells in their atoms

are monoatomic

32 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

But-1-ene

But-1-yne

But-2-yne

But-2-ene

33 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

When ΔH is negative, a reaction is said to be

exothermic

reversible

ionic

endothermic

34 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

low pressure and high temperatures

low pressures and lower temperatures

low temperatures and high pressures

high pressures and high temperatures

35 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the activities is commonly used as a nuclear fuel

uranium

palladium

actium

thorium

36 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

200 cm³ of a gas at 25^oC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm³ at 75^oC.

400.00 mmHg

342.53 mmHg

1430.54 mmHg

467.11 mmHg

37 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The shape of ammonia molecules is

octahedral

tetrahedral

square planar

trigonal planar

38 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The Sulphide which is insoluble in dilute hydrochloric acid is

ZnS

FeS

CuS

Na2S

39 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Hydrogen can be displaced from a lot alkaline solution by

Cu

Sn

Cn

Fe

40 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Diamond cannot be used

In making bicycle chains

As dies for drawing wires

In cutting glass and metals

As abrasives

41 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following properties is not peculiar to matter?

Kinetic energy of particles increases from solid to gas

Orderliness of particles increases from gas to liquid

Random motion of particles increases from gas to solid

Random motion of particles increases from liquid to gas

42 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Calcium

Beryllium

Strontium

Magnesium

43 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Iron

Magnesium

Sodium

Calcium

44 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

50%

66%

40%

25%

45 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Benedict's solution

Dilute ammonia

Tollen's reagent

Sodium hydroxide solution

46 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

2-methylprop-1-ene is an isomer of

2-methyl but-1-ene

3-methyl but-1-ene

pent-2-ene

but-2-ene

47 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

addition reaction

hydrogenation reaction

oxidation reaction

substitution reaction

48 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

React with the solvent in the column

Dissolve in each other in the column

React with each other in the solvent in the column

Move at different speeds in the column

49 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of these require crystallization most?

Cement making

Perfume making

Paint making

Drug making

50 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The leachate of a certain ash is used in local soap because it contain

soluble carbonates and hydrogen carbonate

sodium chloride and potassium hydroxide

sodium hydroxide

potassium hydroxide

51 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

An elements used in production of matches is

copper

sulphur

aluminum

nitrogen

52 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The industrial preparation of hydrogen gas from water gas is referred to as

Contact process

Bayer Process

Haber process

Bosch process

53 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The shape of the S-orbital is

circular

elliptical

spherical

spiral

54 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The oxidation number of iodine in KIO₃ is

+7

+6

+3

+5

55 / 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 valence electrons of the elements in the same period increase progressively across the period

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

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

56 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The tincture of iodine means iodine dissolved in

chlorine water

ethanol

water

bromine chloride

57 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is – (Ag = 108 F = 96500(mol^-1)

108.0g

13.5g

27.0g

54.0g

58 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following statements about catalyst is false?

catalyst do not appear in the balanced equation

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

catalyst reduce the activation energy for a reaction

biological catalysts are called enzymes

59 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment

the litmus turns red and oxygen is evolved

the litmus turns blue but no gas is evolved

the litmus turns blue and oxygen is evolved

the litmus turns blue and hydrogen is evolved

60 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Tartaric acid is used industrially to

dry substance

make baking powder

make fruit juice

remove rust

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