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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.

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

49 questions
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Question 1 of 9 49 total questions
Question 21
jamb 1993
Water has a rather high boiling point despite its low molecular mass because of the presence of?
Ahydrogen bonding
Bcovalent bonding
Cionic bonding
Dmetallic bonding
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Question 22
jamb 1993

Which group of elements forms hydrides that are pyramidal in structure?

AIII
BIV
CV
DVI
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Question 23
jamb 1993
As the difference in electronegativity between bonded atoms increases, polarity of the bond?
Adecreases
Bincreases
Cremains unchanged
Dreduces to zero
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Question 24
jamb 1993
Two atoms represented as U and U are?
Aisomers
Ballotropes
Cisotopes
Danomers
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Question 25
jamb 1993
An element, E, has the electronic configuration 1s22s22p63s2p3. The reaction of E with a halogen X can give?
AEX3 and EX5
BEX3 only
CEX5 only
DEX2 and EX3
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Question 26
jamb 1993
For iodine crystals to sublime on heating, the molecules must acquire energy that is?
Aless than the forces odf attraction in the solid
Bequal to the forces of attraction in th solid
Cnecessary to melt the solid
Dgreater than the forces of attraction in both the solid and the liquid phases
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Question 27
jamb 1993
How many moles of oxygen molecules would be produced from the decomposition of 2.50 moles of potassium trioxochlorate (V)?
A2.50
B3.50
C3.75
D7.50
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Question 28
jamb 1993
A balanced chemical equation obeys the law of?
Aconservation of mass
Bdifinite proportions
Cmultiple proportions
Dconservation of energy
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Question 29
jamb 1993

Which of the following substances is a mixture?

ASulphur powder
BBronze
CDistilled water
DEthanol
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