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Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

48 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

48 questions
All JAMB WAEC NECO CUSTOM
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Question 1 of 8 48 total questions
Question 21
waec 1997
If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is
AX3N
BXN3
CX3N2
DN2X
ENX2
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Question 22
waec 1997
A sodium atom and a sodium ion have the same
Anumber of neutrons
Bnumber of electrons
Celectric charge
Delectronic structure
Echemical properties
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Question 23
waec 1997
In linear molecules, the bond angle is
A90o
B140o
C109o
D120o
E180o
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Question 24
waec 1997
What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
AGroup 0
BGroup 1
CGroup 4
DGroup 6
EGroup 7
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Question 25
waec 1997
Radon is used as a tracer in medical research because it
Ais monatomic
Bis radioactive
Cis a noble gas
Dhas a complete valence shell
Ehas a low boiling point
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Question 26
waec 1997
How many unpaired electrons are there in an atom of an element with the following electronic configuration? 1s22s22p6
Ao
B1
C2
D6
E8
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Question 27
waec 1997
The mass number of an element is the sum of its
Aelectrons, neutrons and protons
Belectrons and protons
Cprotons and neutrons
Dorbital electrons
Evalence electrons
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Question 28
waec 1997

The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as?

ATyndal effect
Bdiffusion
Cosmosis
Dbrownian movement
Edialysis
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