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[ Post UTME Begins ]:
View The List Of Schools That Have Released 2026 Post-UTME Forms.
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Matter and Separation Techniques
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BASIC CHEMISTRY
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chemical symbols, formulae, equations and their uses
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Properties of a system in equilibrium
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Metals of the first transition series
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Introduction to the tetravalency of carbon
Alkanes: Homologous series in relation to physical properties
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Aromatic hydrocarbons e.g. benzene - structure, properties and uses
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Carbohydrates
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Enzymes and their functions
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2046
Which of the following atoms contains the highest number of electrons in the outermost shell?
A.
8
O
B.
10
Ne
C.
15
P
D.
19
K
View Answer & Discuss (3)
WAEC 1999
2047
What is the electronic configuration of an element represented as 19
9
X?
A.
1s
2
2s
2
2p
5
B.
1s
2
2s
2
3s
2
3p
3
C.
1s
2
2s
2
2p
3
3s
2
D.
1s
2
2s
2
2p
6
3s
2
3p
6
4s
1
View Answer & Discuss (7)
WAEC 1999
2048
Pauli Exclusion Principle is related to
A.
quantum numbers of electrons
B.
reversiblility of equlibrium reactions
C.
electronegativity values of elements
D.
collision theory of reaction rates
View Answer & Discuss (2)
WAEC 1999
2049
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
A.
4f
B.
4p
C.
4d
D.
4s
View Answer & Discuss
WAEC 1999
2050
Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
A.
S decays faster than Q
B.
Q is twice as stable as S
C.
Q emits fewer particles than S
D.
S is more stable than Q
View Answer & Discuss
WAEC 1999
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