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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.

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

50 questions
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Question 1 of 10 50 total questions
Question 21
waec 2016

An unsaturated solution differs from a saturated solution at a given temperature because it

ACannot dissolve more solute
BCan hold more solute than it can actually dissolve
CCan still dissolve more solute at given temperature
DForm crystal more easily on cooling
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Question 22
waec 2016
Aluminium is used in the manufacture or aircraft because it
AIs hard and brittle
BIs light and resists corrosion
CHas high density and conducts electricity
DIs malleable and ductile
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Question 23
waec 2016
Metals can be stretched into wires because they are
ADuctile
BGood conductors
CLustrous
DMalleable
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Question 24
waec 2016
The mass of potassium hydroxide required to make 300.ocm3 of 0.4 moldm-3 solution is {KOH = 56.0}
A26.88g
B13.44g
C6.72g
D3.36g
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Question 25
waec 2016
Chemicals that are produced in small quantities and with very degree of purity are
ABulk chemicals
BFine chemicals
CHeavy chemicals
DLight chemicals
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Question 26
waec 2016

The boiling points of HF, H2O and NH3 increase in the order of

ANH3
BH2O < HF
CHF < NH3 < H2O
DNH3 < HF < H2O
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Question 27
waec 2016

When element \(_{20}\)Y combines with element \(_8\)Z, it forms

AA covalent compound , YZ is formed
BA covalent compound, ZY is formed
CAn ionic compound, YZ is formed
DAn ionic compound, ZY is formed
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Question 28
waec 2016

How many electrons are present in \(^9_4Be^{2+}\)?

A2
B4
C5
D6
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Question 29
waec 2016
An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?
A136X
B137X
C196X
D197X
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Question 30
waec 2016
The following atoms of carbon 126C, 136C and 146C can be described as?
AAllotropes
BIsomers
CIsotopes
DIsotones
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