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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.

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

93 questions
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Question 1 of 13 93 total questions
Question 41
jamb 2011

A suitable solvent for iodine and naphthalene is

Acarbon (IV) sulphide
Bethanol
Cwater
Dbenzene
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Question 42
jamb 2011

Hardness of water is mainly due to the presence of

Acalcium hydroxide or magnesium hydroxide
Bcalcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
Csodium hydroxide or magnesium hydroxide
Dcalcium chloride or sodium chloride salts
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Question 43
jamb 2011
What type of bond exits between an element X with atomic number 12 and Y with atomic number 17?
AElectrovalent
BMetallic
CCovalent
DDative
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Question 44
jamb 2011
The importance of sodium aluminate (III) in the treatment of water is to
Acause coagulation
Bneutralize acidity
Cprevent goitre and tooth decay
Dkill germs
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Question 45
jamb 2011

From the diagram above, find the amount of solute deposited when 200 cm\(^3\) of the solution is cooled from 55°C to 40°C.

A0.10 mole
B0.20mole
C0.01 mole
D0.02 mole
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Question 46
jamb 2011
The arrangement of particles in crystal lattices can be studied using
AX - rays
Bγ - rays
Cα - rays
Dβ - rays
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Question 47
jamb 2011
The molecular lattice of iodine is held together by
Adative bond
Bmetallic bond
Chydrogen bond
Dvan der Waal's forces
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Question 48
jamb 2011
An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is
A16
B15
C46
D31
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Question 49
jamb 2011

The relative atomic mass of a naturally occurring lithium consisting of 90% \(^7 _3\)Li and \(^6 _3\)10% Li is

A6.9
B7.1
C6.2
D6.8
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Question 50
jamb 2011
Which of the following questions is correct about the periodic table?
AThe non-metallic properties of the elements tend to decrease across each period
BThe valence electrons of the elements increase progressively across the period
CElements in the same group have the same numbeer of electron shells
DElements in the same period have the number of valence electrons
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Question 51
jamb 2011
From the diagram above, an ideal can be represented by
AM
BN
CK
DL
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Question 52
jamb 2011
Which of the following properties is NOT peculiar to matter?
Akinetic energy of particles increase from solid to gas
BRandom motion of particles increases from liquid to gas
COrderliness of particles increases from gas to liquid
DRandom motion of particles increases from gas to solid
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Question 53
jamb 2011
What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?
[Na = 23, O = 16, H = 1]
A0.40 mol dm-3
B0.50 mol dm-3
C0.05 mol dm-3
D0.30 mol dm-3
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