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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 26:

A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a

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A Neutral non-metal
B Metallic ion
C Non-metallic ion
D Neutral metal

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Question 27:

A difference between chemical and physical change is that in a chemical change

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A Oxygen is consumed
B Heat is supplied
C A reversible process oocurs
D A new substance is formed

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Question 28:

The volume of 2.5 moles of oxygen at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm³]

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A 50.0 dm³
B 84.0 dm³
C 28.0 dm³
D 56.0 dm³

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Question 29:

Nuclear fission involves the splitting of a heavy element into two nuclei of

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A Nearly equal masses with a relaese of energy and radiaton
B Equal masses with a relaese of energy
C Equal masses with a release of energy and radiation
D Unequal masses without any relaese of energy

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Question 30:

What is the molar mass of a substance, if 0.4 mole of the substance has a mass of 25.0g?

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A 62.5 g
B 40.0 g
C 6.3 g
D 2.5 g

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