2018 - JAMB Chemistry Past Questions and Answers - page 3

21

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

A
ethene
B
propane
C
methane
D
butane
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22

The Sulphide which is insoluble in dilute hydrochloric acid is

A
FeS
B
CuS
C
ZnS
D
Na2S
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23

What is the PH of 0.00 1 moldm\(^3\) solution of the sodium hydroxide

A
14
B
13
C
12
D
11
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24

The type of bonding in [Cu(NH\(_3\))\(^4\)]\(^{2+}\) is 

A
coordinate
B
electrovalent
C
metallic
D
covalent
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25

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

A
dissolution of salt in water
B
rusting of iron
C
melting of ice
D
separating a mixture by distillation
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26

To what temperature must a gas at 273k be heated in order to double both its volume and pressure?

A
298K
B
546K
C
819K
D
1092K
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27

According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to

A
decrease
B
A. remain constant
C
B. increase
D
C. be zero
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28

An element used in the production of matches is

A
nitrogen
B
aluminium
C
copper
D
sulphur
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29

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

A
Elements in the same period have the same number of valence electrons
B
The valence electrons of the elements in the same period increase progressively across the period
C
Elements in the same group have the same number of electron shells
D
The non-metallic Properties of the elements tend to decrease across each period
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30

The periodic classification is an arrangement of the elements

A
atomic weights
B
isotopic weights
C
molecular weights
D
atomic numbers
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