2011 - JAMB Chemistry Past Questions and Answers - page 5
41
A
M
B
N
C
K
D
L
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42
Which of the following questions is correct about the periodic table?
A
The non-metallic properties of the elements tend to decrease across each period
B
The valence electrons of the elements increase progressively across the period
C
Elements in the same group have the same numbeer of electron shells
D
Elements in the same period have the number of valence electrons
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43
The relative atomic mass of a naturally occurring lithium consisting of 90% Li and 10% Li is
A
6.9
B
7.1
C
6.2
D
6.8
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44
An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is
A
16
B
15
C
46
D
31
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45
The molecular lattice of iodine is held together by
A
dative bond
B
metallic bond
C
hydrogen bond
D
van der Waal's forces
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46
The arrangement of particles in crystal lattices can be studied using
A
X - rays
B
γ - rays
C
α - rays
D
β - rays
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47
A
0.10 mole
B
0.20mole
C
0.01 mole
D
0.02 mole
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48
The importance of sodium aluminate (III) in the treatment of water is to
A
cause coagulation
B
neutralize acidity
C
prevent goitre and tooth decay
D
kill germs
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49
What type of bond exits between an element X with atomic number 12 and Y with atomic number 17?
A
Electrovalent
B
Metallic
C
Covalent
D
Dative
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