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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.

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

88 questions
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Question 1 of 8 88 total questions
Question 41
jamb 1994
The shape of ammonia molecule is?
Atrigonal planar
Boctahedral
Csquare planar
Dtetrahedral
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Question 42
jamb 1994
The densities of two gases, X and Y, are 0.5 g dm-3 and 2.0 dm-3 respectively.
What is the rate of diffusion of X relative to Y?
A0.1
B0.5
C2.0
D4.0
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Question 43
jamb 1994
For a gas, the relative molecular mass is equal to 2Y. What is Y?
AThe mas of the gas
BThe vapour density of the gas
CThe volume of the gas
DThe temperature of the gas
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Question 44
jamb 1994

To what temperature must a gas 273 K be heated in order to double both its volume and pressure?

A298 K
B546 K
C819 K
D1092 K
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Question 45
jamb 1994

8g CH4 occupies 11.2 dm3 at s.t.p. What volume would 22 g of CH3CH2CH3 occupy under the same condition?

(C = 12, H = 1)

A3.7 dm3
B11.2 dm3
C22.4 dm3
D33.6 dm3
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Question 46
jamb 1994
At the same temperature and pressure, 50 cm3 of nitrogen gas contains the same number of molecules as?
A25 cm3 of methane
B40 cm3 of hydrogen
C50 cm3 of ammonia
D100 cm3 of chlorine
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Question 47
jamb 1994
A pure solid usually melts?
Aover a wide range of temperature
Bover a narrow range of temperature
Cat a lower temperature than the impure one
Dat the same temperature as the impure one
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Question 48
jamb 1994
A mixture of sand, ammonium chloride and sodium chloride is best separated by?
Asublimation followed by addition of water and filteration
Bsublimation followed by addition of water and evaporation
Caddition of water followed by filtration and sublimation
Daddition of water followed by crystallization and sublimation
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