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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.

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

114 questions
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Question 1 of 14 114 total questions
Question 51
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 52
jamb 2015
An elements used in production of matches is
Anitrogen
Baluminum
Ccopper
Dsulphur
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Question 53
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 54
jamb 2015

Which of the noble gases has the greatest ionization energy

AHe
BXe
CAr
DRr
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Question 55
jamb 2015
Atomicity of ozone is
A1
B2
C3
D4
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Question 56
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 57
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 58
jamb 2015

The acid in electrolysis of water is dilute

AHNO3
BCH3COOH
CH2SO4
DHCl
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Question 59
jamb 2015
Vulcanization involve the removal of
Amonometer
Bthe single bond
Cthe double bond
Da polymer
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Question 60
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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Question 61
jamb 2015

In the industrial production of H2 from water gas the CO2 produced along with the H2 is removed by

Awashing under pressure
Bdrying over phosphorus (V) oxide
Cpassing the mixture to the limewater
Dusing ammonical copper (I) chlorine
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Question 62
jamb 2015
Iron is often galvanized in order to
AMake it more malleable
BRemove the impurities unit
CProtect it against corrosion
DRender it passive
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Question 63
jamb 2015
Which of these require crystallization most?
ADrug making
BCement making
CPaint making
DPerfume making
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Question 64
jamb 2015

The filter in the cigarette reduce the nicotine construct by

Aburning
Badsorption
Cevaporation
Dabsorption
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