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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.

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

46 questions
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Question 1 of 6 46 total questions
Question 21
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 22
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 23
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 24
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
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Question 25
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 26
jamb 1995

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

Adiffusion
Bmigration
Creaction
Dsedimentaion
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