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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.

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

91 questions
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Question 1 of 11 91 total questions
Question 41
jamb 2013
In a water body, too much sewage leads to
Aa decrease in the temperature of the water which cause in death of aquatic animals
Ban increase in the number of aquatic animals in the water
Can increase in the bacterial population which reduces the level of oxygen in the water
Da decrease in the bacterial population which increases the level of oxygen in the water
View Explanation & Discuss
Question 42
jamb 2013

The solvent used for removing grease stain is

Aturpentine
Bammonia solution
Cethanol
Dsolution of borax in water
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Question 43
jamb 2013
An example of a hygroscopic substance is
ACuO (S).
BMgCL2(S).
CCaCL2(S).
DNaOH(S).
View Explanation & Discuss
Question 44
jamb 2013
Steam changes the colour of anhydrous cobalt (ll) chloride from
Awhite to red
Bblue to white
Cblue to pink
Dwhite to blue
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Question 45
jamb 2013
The constituent of air that acts as a diluent is
Anitrogen
Bcarbon (IV) oxide
Cnoble gases
Doxygen
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Question 46
jamb 2013
The bond formed between two elements with electron configurations 1s2 2s2 2p6 3s2 and 1s2 2s2 2p4 is
Ametallic
Bcovalent
Cdative
Dionic
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Question 47
jamb 2013

Which of the following molecules is held together by hydrogen bond?

ACH4
BHBr
CH2SO4
DHF
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Question 48
jamb 2013
The shape of the carbon (lV) oxide molecule is
Apyramidal
Blinear
Cangular
Dtetrahedral
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Question 49
jamb 2013
The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
Acarbon-14
Bphosphorus-32
Ccobalt-60
Diodine-131
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Question 50
jamb 2013
What volume of carbon (ll) oxide is produced by reacting excess carbon with 10 dm3 of oxygen?
A5 dm 3
B20 dm 3
C15 dm 3
D10 dm 3
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Question 51
jamb 2013

The presence of an impurity in substance will cause the melting point to

Abe zero
Breduce
Cincrease
Dbe stable
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