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.

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

64 questions
Question 1 of 20 64 total questions
Question 21
jamb 2015

Which of the following ions  requires the largest quantity of electricity for discharge at an electrode?

A2.0 mole of Q3+
B2.5 mole of R2+
C3.0 mole of T-
D4.0 mole of Y-
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Question 22
jamb 2015

A fixed mass of gas occupies 92cm3 at 3°C. What will be its volume at 18C if the pressure remains constant?

A15.3cm3
B87.3cm3
C2.0cm3
D97.0cm3
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Question 23
jamb 2015
P1V1 = P2V2 supports ?
ACharles’s law
BBoyles’s law
CGraham’s law
DAvogadro’s law
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Question 24
jamb 2015
Tartaric acid is used industrially to
Amake baking powder
Bmake fruit juice
Cremove rust
Ddry substance
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Question 25
jamb 2015
A liquid that will dissolve fat is
Ahydrochloric acid
Bcalcium hydrochloride
Ckerosene
Dwater
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Question 26
jamb 2015
In the production of soap, concentrated sodium chloride solution is added to
Aincrease the solubility of soap
Bdecrease the solubility of the soap
Csaponify the soap
Demulsify the soap
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Question 27
jamb 2015
Which of the following metals burns with brick red
APb
BCa
CNa
DMg
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Question 28
jamb 2015
The above orbital diagram shown the electronic configuration of
Achlorine
Bnitrogen
Ccalcium
Dneon
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Question 29
jamb 2015
A suitable reagent for distinguish between ethanoic and ethanol is
Abromine water
BFehling’s solution
Csodium hydrogen trioxocarbonate (iv)
DAmmoniacal silver trioxonitrate(V)
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Question 30
jamb 2015
Flow of current in electrolytes is due to the movement of
Aelectrons
BHoles and electron
CIons
DCharges
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Question 31
jamb 2015
Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays
Aare positively charged
Bare negatively charged
CHave mass
Dtravel in straight lines
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Question 32
jamb 2015
An elements used in production of matches is
Anitrogen
Baluminum
Ccopper
Dsulphur
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Question 33
jamb 2015
The weakest attractive force that can be observed between two molecules is
Aionic
Bcovalent
Cco-ordinate covalent
Dvander Waals
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Question 34
jamb 2015

Which of the noble gases has the greatest ionization energy

AHe
BXe
CAr
DRr
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Question 35
jamb 2015
Atomicity of ozone is
A1
B2
C3
D4
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Question 36
jamb 2015
When salt loses its water of crystallization to the atmosphere on exposure, the process is said to be
Aefflorescence
Bdéliquescence
Ceffervescence
Dfluorescence
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Question 37
jamb 2015

A small quantity of solid ammonium chloride (NH4Cl) heated gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit was absence on the cooler part of the test tube. The ammonium chloride is to have undergo

Adistillation
Bsublimation
Cprecipitation
Devaporation
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Question 38
jamb 2015

The acid in electrolysis of water is dilute

AHNO3
BCH3COOH
CH2SO4
DHCl
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Question 39
jamb 2015
Vulcanization involve the removal of
Amonometer
Bthe single bond
Cthe double bond
Da polymer
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Question 40
jamb 2015

The gas that is most useful in protecting humans against solar marathon is

Achlorine
Bozone
Ccarbon IV oxide
Dhydrogen sulphide
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