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
correct option: a
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22

The Sulphide which is insoluble in dilute hydrochloric acid is

A
FeS
B
CuS
C
ZnS
D
Na2S
correct option: b
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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
correct option: d
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24

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

A
coordinate
B
electrovalent
C
metallic
D
covalent
correct option: a
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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
correct option: b
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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
correct option: d
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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
correct option: b
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28

An element used in the production of matches is

A
nitrogen
B
aluminium
C
copper
D
sulphur
correct option: d
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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
correct option: d
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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
correct option: d

In the periodic table, elements are arranged according to their atomic number (that is, proton number).

In the periodic table, electronegativity increase from left to right while atomic radius increases down the group

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