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 401· Kinetic theory of matter and gas laws· JAMB
Under the same conditions, which of the following gases diffuses fastest?
Show answer
Answer: D. hydrogen
Explanation and discussion
Question 402· Kinetic theory of matter and gas laws· JAMB
An assumption of the kinetic theory of an ideal gas is that
Show answer
Answer: B. there are no forces of attraction between the molecules
Explanation and discussion
Question 403· Kinetic theory of matter and gas laws· JAMB
Brownian motion provides evidence that
Show answer
Answer: D. particles of matter are in constant random motion
Explanation and discussion
Question 404· Kinetic theory of matter and gas laws· JAMB
The volume of 0.5 mol of a gas at s.t.p. is: (molar volume = 22.4 dm³)
Show answer
Answer: D. 11.2 dm³
Explanation and discussion
Question 405· Kinetic theory of matter and gas laws· WAEC
The relative rates of diffusion of hydrogen and oxygen are
Show answer
Answer: D. 4 : 1
Explanation and discussion
Question 406· Kinetic theory of matter and gas laws· JAMB
500 cm³ of a gas at 1 atm is compressed to 250 cm³ at constant temperature. Find the new pressure.
Show answer
Answer: D. 2 atm
Explanation and discussion
Question 407· Kinetic theory of matter and gas laws· JAMB
A mixture of nitrogen and oxygen has a total pressure of 3 atm. If the partial pressure of nitrogen is 2 atm, find the partial pressure of oxygen.
Show answer
Answer: A. 1 atm
Explanation and discussion
Question 408· Kinetic theory of matter and gas laws· WAEC
At s.t.p., one mole of any gas occupies a volume of
Show answer
Answer: B. 22.4 dm³
Explanation and discussion
Question 409· Kinetic theory of matter and gas laws· WAEC
The particles of a solid
Show answer
Answer: B. vibrate about fixed positions
Explanation and discussion
Question 410· Kinetic theory of matter and gas laws· WAEC
Why does the pressure of gas in a sealed tin rise when the tin is heated?
Show answer
Answer: B. Its molecules move faster and hit the walls harder and more often
Explanation and discussion
Question 411· Kinetic theory of matter and gas laws· WAEC
Which gas diffuses fastest?
Show answer
Answer: C. hydrogen
Explanation and discussion
Question 412· Kinetic theory of matter and gas laws· JAMB
A gas occupies 200 cm³ at 0 °C. Find its volume at 273 °C if the pressure stays constant.
Show answer
Answer: B. 400 cm³
Explanation and discussion
Question 413· Kinetic theory of matter and gas laws· WAEC
Which of the following gases diffuses fastest? (H = 1, He = 4, C = 12, O = 16)
Show answer
Answer: B. H₂
Explanation and discussion
Question 414· Kinetic theory of matter and gas laws· JAMB
A mixture of 2 mol of nitrogen and 3 mol of oxygen has a total pressure of 100 kPa. Find the partial pressure of oxygen.
Show answer
Answer: B. 60 kPa
Explanation and discussion
Question 415· Kinetic theory of matter and gas laws· JAMB
Under the same conditions, which sample has the same volume as 4 g of helium? (He = 4, H = 1)
Show answer
Answer: D. 2 g of hydrogen gas
Explanation and discussion
Question 416· Kinetic theory of matter and gas laws· WAEC
Which assumption of the kinetic theory fails for real gases at high pressure?
Show answer
Answer: A. that the volume of the molecules themselves is negligible
Explanation and discussion
Question 417· Kinetic theory of matter and gas laws· JAMB
What volume does 8 g of oxygen gas occupy at s.t.p.? (O = 16; molar volume = 22.4 dm³)
Show answer
Answer: B. 5.6 dm³
Explanation and discussion
Question 418· Kinetic theory of matter and gas laws· JAMB
A gas occupies 300 cm³ at 27 °C. At constant pressure, its volume at 127 °C is:
Show answer
Answer: A. 400 cm³
Explanation and discussion
Question 419· Kinetic theory of matter and gas laws· JAMB
At constant volume, the pressure of a gas increases when it is heated because its molecules
Show answer
Answer: A. hit the walls more often and with greater force
Explanation and discussion
Question 420· Kinetic theory of matter and gas laws· JAMB
Dalton's law of partial pressures states that the total pressure of a gas mixture equals
Show answer
Answer: B. the sum of the partial pressures
Explanation and discussion

Practise Chemistry like the real exam. A timed CBT, your score, and the topics to fix.

Start a Chemistry test

JAMB and WAEC Chemistry questions

Under the same conditions, which of the following gases diffuses fastest?

An assumption of the kinetic theory of an ideal gas is that

Brownian motion provides evidence that

The volume of 0.5 mol of a gas at s.t.p. is: (molar volume = 22.4 dm³)

The relative rates of diffusion of hydrogen and oxygen are

500 cm³ of a gas at 1 atm is compressed to 250 cm³ at constant temperature. Find the new pressure.

A mixture of nitrogen and oxygen has a total pressure of 3 atm. If the partial pressure of nitrogen is 2 atm, find the partial pressure of oxygen.

At s.t.p., one mole of any gas occupies a volume of

The particles of a solid

Why does the pressure of gas in a sealed tin rise when the tin is heated?

Which gas diffuses fastest?

A gas occupies 200 cm³ at 0 °C. Find its volume at 273 °C if the pressure stays constant.

Which of the following gases diffuses fastest? (H = 1, He = 4, C = 12, O = 16)

A mixture of 2 mol of nitrogen and 3 mol of oxygen has a total pressure of 100 kPa. Find the partial pressure of oxygen.

Under the same conditions, which sample has the same volume as 4 g of helium? (He = 4, H = 1)

Which assumption of the kinetic theory fails for real gases at high pressure?

What volume does 8 g of oxygen gas occupy at s.t.p.? (O = 16; molar volume = 22.4 dm³)

A gas occupies 300 cm³ at 27 °C. At constant pressure, its volume at 127 °C is:

At constant volume, the pressure of a gas increases when it is heated because its molecules

Dalton's law of partial pressures states that the total pressure of a gas mixture equals