2022 - JAMB Chemistry Past Questions and Answers - page 1

1

The sub-atomic particles located in the nucleus of an atom are?

A

neutron and proton

B

proton and electron

C

proton and ions

D

neutron and electron

correct option: a

Nucleons have protons and neutrons. The protons contain the positive charge of an atom and the neutrons are neutrally charged. Electrons, which are negatively charged, are located outside of the nucleus.

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2

The IUPAC nomenclature of the structure shown is?

A

3-chloro-3-methylbutane

B

2,2,-dichloro-3-methylbutane

C

3-methylchlorobutane

D

2-chloro-2-methylbutane

correct option: d

Alkanes consist of single-bonded carbon and hydrogen atoms and lack any other functional groups. 

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3

SO\(_2\) + O\(_2\) → 2SO\(_3\)

In the reaction above, the most suitable catalyst is?

A

chromium(vi)oxide

B

iron(iii)oxide

C

copper(i)oxide

D

vanadium(v)oxide

correct option: d

The contact Process is an industrial method of producing sulfuric acid during which sulfur dioxide is converted into sulfur trioxide, by passing sulfur dioxide and oxygen over a solid vanadium(V) oxide catalyst.

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4

In the preparation of salts, the method employed will depend on the?

A

composition

B

dissociating ability

C

stability to heat

D

precipitating ability

correct option: c
  • solubility of the salt in water
  • heat stability of the salt
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5

The following non-metal form acidic oxides with oxygen except?

A

phosphorus

B

sulphur

C

carbon

D

chlorine

correct option: c

Carbon monoxide is a neutral oxide as it neither reacts with acids nor reacts with bases.

Carbon monoxide is produced when combustion reactions are not fully completed, either through lack of oxygen or due to low mixing.

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6

How many neutrons are present in an atom with the mass number and atomic number 37 and 17 respectively?

A

18

B

20

C

37

D

17

correct option: b

mass number = number of neutrons + atomic number

number of neutrons = mass number - atomic number

=> 37 - 17 = 20

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7

The sulphide that is commonly used in coating electric fluorescent tubes is?

A

iron(ii)Sulphide

B

tin(ii)sulphide

C

Zinc Sulphide

D

lead(iv) Sulphide

correct option: c

ZnS (Zinc Sulfide) as it emits a flash of light when struck by an alpha particle by a phenomenon known as Radio luminescence in which a flash of light is observed on the screen when acted upon by a radioactive substance.

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8

An organic compound which liberates carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be?

A

C\(_2\)H\(_5\)OH

B

C\(_3\)H\(_4\)

C

C\(_6\)H\(_6\)

D

CH\(_3\)COOH

correct option: d

Carboxylic acid is an organic compound containing a carboxyl functional group.

Carboxylic acids and Enols react with sodium bicarbonate to liberate carbon dioxide.

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9

The addition of sodium chloride to water to form a solution would lead to?

A

increase in freezing point and increase the boiling point

B

increase in freezing point and decrease the boiling point

C

decrease in freezing point and decrease the boiling point

D

decrease in freezing point and increase the boiling point

correct option: d

Adding salt to water lowers its freezing point and raises its boiling point.

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10

A chemical widely used as a fertilizer is?

A

galena

B

bauxite

C

emerald

D

nitrochalk

correct option: d

Calcium Ammonium Nitrate or CAN (nitro-limestone or nitrochalk), is a widely used inorganic fertilizer.

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