JAMB CHEMISTRY PAST QUESTIONS

Name: JAMB CHEMISTRY PAST QUESTIONS - 2022 | School Portal NG
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JAMB CHEMISTRY PAST QUESTIONS - 2022

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

A mixture is different from a compound because

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

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

2 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

2-methylprop-1-ene is an isomer of

2-methyl but-1-ene

pent-2-ene

but-2-ene

3-methyl but-1-ene

3 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

An elements used in production of matches is

aluminum

copper

sulphur

nitrogen

4 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

In electrovalency, the oxidation number of the participating metal is always

decreasing

constant

increasing

neutral

5 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Diamond cannot be used

In making bicycle chains

In cutting glass and metals

As dies for drawing wires

As abrasives

6 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

12

16

40

48

7 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

using ammonical copper (I) chlorine

washing under pressure

passing the mixture to the limewater

drying over phosphorus (V) oxide

8 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Move at different speeds in the column

React with each other in the solvent in the column

React with the solvent in the column

Dissolve in each other in the column

9 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Iron is often galvanized in order to

Make it more malleable

Protect it against corrosion

Render it passive

Remove the impurities unit

10 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Q will form an electrovalent bond with S

P will form an electrovalent bond with R

R will form an electrovalent bond with S

Q will form a covalent bond with S

11 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Tin is unaffected by air at ordinary temperature due to its

Low melting point

Weak electropositive character

High boiling point

White lustrous appearance

12 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Carbonation

Catenation

Alkylation

Acylation

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Category: JAMB CHEMISTRY PAST QUESTIONS

In the discovery of protein, the instrument used is

glass tube and discharge tube

discharge tube with terminal cathode

cathode ray tube

discharge tube with central cathode

14 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Ethanol is soluble in water due to the presence of a

Methyl group

Phenyl group

Carbonyl group

Hydroxyl group

15 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

ionic bond

covalent bond

electrovalent bond

co-ordinate bond

16 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Na, P, O and Cl

Li, Be, Al and D

N2, Mg, S and Ar

B, C, N, and O

17 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Decantation

Distillation

Sublimation

Evaporation

18 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the activities is commonly used as a nuclear fuel

thorium

uranium

actium

palladium

19 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Sodium hydroxide solution

Benedict's solution

Tollen's reagent

Dilute ammonia

20 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Magnesium

Calcium

Sodium

Iron

21 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

A second alkanol can be oxidized to give an

See also CHEMISTRY POST UTME

The weakest attractive force that can be observed between two molecules is

vander Waals

covalent

co-ordinate covalent

ionic

46 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

82

49

196

106

47 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The above orbital diagram shown the electronic configuration of

calcium

neon

nitrogen

chlorine

48 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The number of electronic shells contained in an atom with electron configuration 1s²2s²2p⁶3s²3p⁶4s² is

3

2

5

4

49 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

Ca

Cn

Sn

Zn

50 / 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 only

I and II only

III only

51 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

ΔH is positive and TΔ S is zero

ΔH is negative and TΔ S is zero

ΔH is positive and T Δ S is negative

ΔH is zero and T Δ S is positive

52 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Flow of current in electrolytes is due to the movement of

holes and electron

Electrons

Ions

Charges

53 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

Which of the following statements about catalyst is false?

catalyst do not appear in the balanced equation

biological catalysts are called enzymes

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

catalyst reduce the activation energy for a reaction

54 / 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 and ii only

i and iv only

i, ii, iii and iv only

i only

55 / 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

are positively charged

are negatively charged

have mass

56 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

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

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

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

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

57 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The shape of ammonia molecules is

trigonal planar

octahedral

tetrahedral

square planar

58 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

The constituent common to duralumin and alnico is

Mg

Al

Co

Mn

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 blue and hydrogen is evolved

the litmus turns blue but no gas is evolved

the litmus turns red and oxygen is evolved

the litmus turns blue and oxygen is evolved

60 / 60

Category: JAMB CHEMISTRY PAST QUESTIONS

There are basic particles from which matter called be made except

Ion

Molecule

Salt

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