JAMB and WAEC Chemistry questions

800 questions with answers and explanations. Tap an option to check yourself.

All topics Acids, bases and salts · 58 Air · 37 Atomic structure and bonding · 59 Chemical combination · 58 Chemical equilibrium · 37 Chemistry and industry · 35 Electrolysis · 41 Energy changes · 38 Environmental pollution · 32 Kinetic theory of matter and gas laws · 45 Metals and their compounds · 47 Non-metals and their compounds · 45 Organic compounds · 72 Oxidation and reduction · 41 Rates of chemical reaction · 38 Separation of mixtures and purification · 42 Solubility · 36 Water · 39

Question 421· Kinetic theory of matter and gas laws· WAEC
Which of these gases diffuses fastest at the same temperature? [H = 1, He = 4, N = 14, O = 16]
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Answer: D. helium
Explanation and discussion
Question 422· Kinetic theory of matter and gas laws· WAEC
A gas has a volume of 250 cm³ at 27 °C. Find its volume at 87 °C at constant pressure.
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Answer: D. 300 cm³
Explanation and discussion
Question 423· Kinetic theory of matter and gas laws· JAMB
How many moles of gas occupy 24 dm³ at room temperature and pressure? (Molar volume = 24 dm³)
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Answer: B. 1 mol
Explanation and discussion
Question 424· Kinetic theory of matter and gas laws· JAMB
Ammonia and hydrogen chloride are released at opposite ends of a long tube. A white ring forms nearer the hydrogen chloride end because
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Answer: D. ammonia diffuses faster, being lighter
Explanation and discussion
Question 425· Kinetic theory of matter and gas laws· JAMB
Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain
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Answer: B. equal numbers of molecules
Explanation and discussion
Question 426· Kinetic theory of matter and gas laws· JAMB
Brownian motion provides evidence for
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Answer: A. the random motion of particles
Explanation and discussion
Question 427· Kinetic theory of matter and gas laws· JAMB
The heating curve shows a pure solid heated steadily. The substance is melting between
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Answer: C. B and C
Explanation and discussion
Question 428· Kinetic theory of matter and gas laws· WAEC
Diffusion is fastest in
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Answer: C. gases
Explanation and discussion
Question 429· Kinetic theory of matter and gas laws· WAEC
Gas X diffuses four times as fast as oxygen under the same conditions. Find the relative molecular mass of X. [O = 16]
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Answer: D. 2
Explanation and discussion
Question 430· Kinetic theory of matter and gas laws· JAMB
Under the same conditions, hydrogen (H₂ = 2) diffuses how many times as fast as oxygen (O₂ = 32)?
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Answer: B. 4
Explanation and discussion
Question 431· Kinetic theory of matter and gas laws· JAMB
What volume does 2 g of hydrogen gas occupy at s.t.p.? (H = 1; molar volume = 22.4 dm³)
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Answer: A. 22.4 dm³
Explanation and discussion
Question 432· Kinetic theory of matter and gas laws· WAEC
According to the kinetic theory, gas pressure is caused by
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Answer: B. collisions of molecules with the container walls
Explanation and discussion
Question 433· Kinetic theory of matter and gas laws· JAMB
A gas has a vapour density of 32. Find its relative molecular mass.
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Answer: A. 64
Explanation and discussion
Question 434· Kinetic theory of matter and gas laws· JAMB
According to Graham's law, the ratio of the rate of diffusion of hydrogen to that of oxygen is [H = 1, O = 16]
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Answer: A. 4 : 1
Explanation and discussion
Question 435· Kinetic theory of matter and gas laws· WAEC
According to the kinetic theory, the particles of a gas
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Answer: D. move randomly at high speed
Explanation and discussion
Question 436· Kinetic theory of matter and gas laws· JAMB
A gas occupies 100 cm³ at 2 atm and 300 K. Find its volume at 1 atm and 450 K.
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Answer: D. 300 cm³
Explanation and discussion
Question 437· Kinetic theory of matter and gas laws· WAEC
A fixed mass of gas occupies 600 cm³ at 300 K and 1 atm. Find its volume at 400 K and 2 atm.
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Answer: B. 400 cm³
Explanation and discussion
Question 438· Kinetic theory of matter and gas laws· JAMB
A gas occupies 300 cm³ at 27 °C. Find its volume at 87 °C if the pressure stays constant.
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Answer: D. 360 cm³
Explanation and discussion
Question 439· Kinetic theory of matter and gas laws· JAMB
A gas X diffuses at half the rate of methane (CH₄ = 16) under the same conditions. Find the relative molecular mass of X.
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Answer: C. 64
Explanation and discussion
Question 440· Kinetic theory of matter and gas laws· WAEC
The particles in a solid
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Answer: B. vibrate about fixed positions
Explanation and discussion

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JAMB and WAEC Chemistry questions

Which of these gases diffuses fastest at the same temperature? [H = 1, He = 4, N = 14, O = 16]

A gas has a volume of 250 cm³ at 27 °C. Find its volume at 87 °C at constant pressure.

How many moles of gas occupy 24 dm³ at room temperature and pressure? (Molar volume = 24 dm³)

Ammonia and hydrogen chloride are released at opposite ends of a long tube. A white ring forms nearer the hydrogen chloride end because

Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain

Brownian motion provides evidence for

The heating curve shows a pure solid heated steadily. The substance is melting between

Diffusion is fastest in

Gas X diffuses four times as fast as oxygen under the same conditions. Find the relative molecular mass of X. [O = 16]

Under the same conditions, hydrogen (H₂ = 2) diffuses how many times as fast as oxygen (O₂ = 32)?

What volume does 2 g of hydrogen gas occupy at s.t.p.? (H = 1; molar volume = 22.4 dm³)

According to the kinetic theory, gas pressure is caused by

A gas has a vapour density of 32. Find its relative molecular mass.

According to Graham's law, the ratio of the rate of diffusion of hydrogen to that of oxygen is [H = 1, O = 16]

According to the kinetic theory, the particles of a gas

A gas occupies 100 cm³ at 2 atm and 300 K. Find its volume at 1 atm and 450 K.

A fixed mass of gas occupies 600 cm³ at 300 K and 1 atm. Find its volume at 400 K and 2 atm.

A gas occupies 300 cm³ at 27 °C. Find its volume at 87 °C if the pressure stays constant.

A gas X diffuses at half the rate of methane (CH₄ = 16) under the same conditions. Find the relative molecular mass of X.

The particles in a solid