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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.

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

52 questions
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Question 1 of 12 52 total questions
Question 21
jamb 1994
Element X, Y and Z belong to a groups I, V and VII respectively. Which of the following is TRUE about the bond types of XZ and YZ3?
ABoth are electrovalent
BBoth are covalent
CXZ is electrovalent and YZ3 is covalent
DXZ is covalent and YZ3 is electrovalent
View Explanation & Discuss
Question 22
jamb 1994

Which of the following physical properties decreases down a group in the periodic table?

AAtomic radius
BIonic radius
CElectropositivity
DElectronegativity
View Explanation & Discuss
Question 23
jamb 1994
The number of electrons in the valence shell of an element of atomic number 14 is?
A1
B2
C3
D4
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Question 24
jamb 1994

An increase in temperature causes an increase in the pressure of a gas because?

Ait decreases the number of collision between the molecules
Bthe molecules of the gas bombard the walls of the container more frequently
Cit increases the number of collision between the molecules
Dit causes the molecules to combine
View Explanation & Discuss
Question 25
jamb 1994
The shape of ammonia molecule is?
Atrigonal planar
Boctahedral
Csquare planar
Dtetrahedral
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Question 26
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
View Explanation & Discuss
Question 27
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 28
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 29
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
View Explanation & Discuss
Question 30
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 31
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 32
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
View Explanation & Discuss
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