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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.

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

75 questions
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Question 1 of 15 75 total questions
Question 31
jamb 1995
The difference between colloides and and suspensions is brought out clearly by the fact that while colloids?
Ado not scatter light, suspensions do
Bcan be separated by filtration, suspension cannot be so separated
Ccan be separated by a membrane, suspensions cannot
Ddo not settle out on standing, suspensions do
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Question 32
jamb 1995
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain?
Aethane
Bchlorine
Chydrogen chloride
Dethene
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Question 33
jamb 1995
Deliquescent substances are also?
Aefflorescent
Banhydrous
Chygroscopic
Dinsoluble
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Question 34
jamb 1995
Helium is often used in observation balloons because it is?
Alight and combustible
Blight and non-combustible
Cheavy and combustible
Dheavy and non-combustible
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Question 35
jamb 1995

Which of the following statements is FALSE about isotopes of the same element?

AThey have the same number of electrons in their outermost shells
BThey have different atomic masses
CThey have the same atomic number and the number of electrons
DThey have the same atomic number but different number of electrons
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Question 36
jamb 1995
The ability of ionic solids is generally due to the?
Anegative electron affinity of most atoms
Bcrystal lattice forces
Celectron pair sharing
Dpositive ionization potentials
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Question 37
jamb 1995
In the oil drop experiment, Millikan determined the?
Acharge to mass ratio of the electron
Bmass of the electron
Ccharge of the electron
Dmass of the proton
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Question 38
jamb 1995

A particle that contains 8 proton, 9 neutrons and 7 electrons could be written as?

AO
BO+
CN
DO-
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Question 39
jamb 1995

A liquid begins to boil when?

Aits vapour pressure is equal to the vapour pressure of its solid at the given temperature
Bmolecules start escaping from its surface
Cits vapour pressure equals the atmosphere pressure
Dits volume is sightly increased
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Question 40
jamb 1995

Two cylinders A and B each contains 30 cm\(^3\) of oxygen and nitrogen respectively at the same temperature and pressure. If there are 5.0 moles of nitrogen, then the mass of oxygen is?

A3.2 g
B6.4 g
C80.0 g
D160.0 g
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Question 41
jamb 1995
A gas sample with an initial volume of 3.25 dm3 is heated and allowed to expand to 9.75 dm3 at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature?
A3:1
B5:2
C5:4
D8:3
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Question 42
jamb 1995

What volume of oxygen will remain after reacting 8cm\(^3\) of hydrogen with 20cm\(^3\) of oxygen?

A10 cm3
B12 cm3
C14 cm3
D16 cm3
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Question 43
jamb 1995

The number of hydrogen ions in 4.9 g of tetraoxosulphate (IV) acid is?

(S = 32, O =16, H = 1, Avogadro Number = 6.02 x 10\(^{23}\) )

A3.01 x 1022
B6.02 x 1022
C3.01 x 1023
D6.01 x 1023
View Explanation & Discuss
Question 44
jamb 1995
Which of the following is a example of a chemical change?
ADissoultion of salt in water
BRusting of iron
CMelting of ice
DSeparating a mixture by distillation
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Question 45
jamb 1995

Chromatography is used to separate components of mixtures which differ in their rates of?

Adiffusion
Bmigration
Creaction
Dsedimentaion
View Explanation & Discuss
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