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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.

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

87 questions
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Question 1 of 7 87 total questions
Question 41
jamb 1992
An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?
Anumber of molecules of the gas
Bdensity of the gas molecules
Cnumber of collisions between the gas molecules
Dnumber of collisions between the gas molecules and the walls of the container
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Question 42
jamb 1992
If 100 cm3 of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is?



(O = 16, H = 1)
A10.0 s
B12.5 s
C17.7 s
D32.0 s
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Question 43
jamb 1992
Which of the following is a measure of the average kinetic energy of the molecules of a substance?
AVolume
BMass
Cpressure from age grades
DTemperature
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Question 44
jamb 1992
A given mass of gas occupies 2 dm3 at 300k. At what temperature will its volume be doubled keeping the pressure constant?
A400 k
B480 k
C550 k
D600 k
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Question 45
jamb 1992
wH2SO4 + xAI(OH)3 → yH2O + = zAI2(SO4)3. The respective values of w.x.y and z in the equation above are?
A2,2,5 and 1
B3,2,5 and 2
C3,2,6 and 1
D2,2,6 and 2
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Question 46
jamb 1992
How many moles of (H+) are there in 1 dm3 of 0.5 M solution of H2SO4?
A2.0 moles
B1.0 moles
C0.5 mole
D0.25 mole
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Question 47
jamb 1992

There is a large temperature interval between the melting point and the boiling point of a metal because?

Ametals have very high melting points
Bmetals conduct heat very repaidly
Cmelting does not break the metalic bond but boiling does
Dthe crystal lattice of metals is easily broken
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