JAMB CHEMISTRY PAST QUESTIONS

JAMB CHEMISTRY PAST QUESTIONS

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1 / 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 different number of carbon atoms

They have the same chemical properties

They are members of same homologous series

2 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

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

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

iodine attacks the starch to give the blue-black color

chlorine attacks the starch to give the blue-black color

3 / 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

4 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

butane

ethene

methane

propane

5 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

oxidation reaction

substitution reaction

addition reaction

hydrogenation reaction

6 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

An isomer of C₅H₁₂ is

2–methyl propane

2–ethyl butane

butane

2–methyl butane

7 / 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

8 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The above orbital diagram shown the electronic configuration of

calcium

nitrogen

chlorine

neon

9 / 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.

467.11 mmHg

342.53 mmHg

400.00 mmHg

1430.54 mmHg

10 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region

which contains protons and neutrons

which is very large and in which close to 98% of projectiles pass undeflected

which is massive and can cause deflection of a few projectiles

which is positively charged

11 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

increase the solubility of soap

decrease the solubility of the soap

saponify the soap

emulsify the soap

12 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the noble gases has the greatest ionization energy

13 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.

128

14 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The periodic classification is an arrangement of the elements

atomic numbers

molecular weights

isotopic weights

atomic weights

15 / 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)

54.0g

13.5g

27.0g

108.0g

16 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

When ΔH is negative, a reaction is said to be

exothermic

reversible

endothermic

ionic

17 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

There are basic particles from which matter called be made except

Salt

Atom

Ion

Molecule

18 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

R will form an electrovalent bond with S

P will form an electrovalent bond with R

Q will form a covalent bond with S

Q will form an electrovalent bond with S

19 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Aluminium hydroxide is used in the dyeing industry as a

salt

dispersant

mordant

dye

20 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

chlorine

carbon IV oxide

ozone

hydrogen sulphur

21 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

P1V1 = P2V2 supports ?

Boyles’s law

Graham’s law

Avogadro’s law

Charles’s law

22 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The filter in the cigarette reduce the nicotine construct by

absorption

burning

absorption

evaporation

23 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Fractional crystallization

Fractional distillation

Filtration

Evaporation

24 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Cast iron is used in making

Iron sheets and retort stand

Stoves and cookers

Chains and agricultural implements

Nails and iron rods

25 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The shape of the S-orbital is

spherical

elliptical

circular

spiral

26 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Acylation

Alkylation

Catenation

Carbonation

27 / 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

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

28 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The colour of litmus in an alkaline medium is

Blue

Pink

Yellow

Red

29 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

2-methylprop-1-ene is an isomer of

2-methyl but-1-ene

but-2-ene

pent-2-ene

3-methyl but-1-ene

30 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A given mass of gas occupies 2dm³ at 300k. At what temperature will its volume be doubled, keeping the pressure constant?

400k

550k

600k

480k

31 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following properties is not peculiar to matter?

Random motion of particles increases from gas to solid

Kinetic energy of particles increases from solid to gas

Orderliness of particles increases from gas to liquid

Random motion of particles increases from liquid to gas

32 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The number of isomers formed by C₆H₁₄ is

33 / 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 only

I, II and III

I and II only

III only

34 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Tartaric acid is used industrially to

make fruit juice

remove rust

dry substance

make baking powder

35 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

atomic mass

relative isotopic mass

nuclear charge

relative atomic number

36 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Rare gases are suitable because they

are volatile gases

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

form ions easily

are monoatomic

37 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The tincture of iodine means iodine dissolved in

water

ethanol

bromine chloride

chlorine water

38 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

50%

25%

66%

40%

39 / 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

40 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

rusting of iron

dissolution of salt in water

separating a mixture by distillation

melting of ice

41 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The shape of ammonia molecules is

trigonal planar

tetrahedral

square planar

octahedral

42 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A second alkanol can be oxidized to give an

alkanone

alkyne

alkanal

alkanoic acid

43 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The constituent common to duralumin and alnico is

44 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following does not support the fact that air is a mixture?

it cannot be represented with a chemical formula

the constituents of air are in a fixed proportion by mass

the constituents of air can be separated by physical by physical means

none of the above

45 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Strontium

Magnesium

Beryllium

Calcium

46 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

B, C, N, and O

Na, P, O and Cl

Li, Be, Al and D

N2, Mg, S and Ar

47 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The oxidation number of iodine in KIO₃ is

48 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the activities is commonly used as a nuclear fuel

thorium

actium

palladium

uranium

49 / 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

evaporation

distillation

sublimation

precipitation

50 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Decantation

Distillation

Sublimation

Evaporation

51 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Dilute ammonia

Tollen's reagent

Sodium hydroxide solution

Benedict's solution

52 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A major source of oxide of oxygen is from the burning of

fuel

coal

chlorofluorocarbons

wood

53 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The Sulphide which is insoluble in dilute hydrochloric acid is

ZnS

Na2S

FeS

CuS

54 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The energy value of petrol can be determined by

Fractionating column

Bomb calorimeter

Catalytic cracker

Thermometer

55 / 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

cracking

degradation

disintegration

polymerization

56 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

57 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Cobalt-60

Phosphorus-32

Carbon-14

Iodine-131

58 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Burning magnesium ribbon in air removes which of the following

(i) oxygen (ii) nitrogen (iii) argon and (iv) carbon(iv)oxide?

i, ii, iii and iv only

i only

i and iv only

i and ii only

59 / 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]

10.80

0.10

0.05

10.00

60 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of these alloys contains copper?

bronze

steel

solder

permallory

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