WAEC Chemistry questions

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

All topics Acids, bases and salts · 26 Air · 16 Atomic structure and bonding · 26 Chemical combination · 27 Chemical equilibrium · 16 Chemistry and industry · 17 Electrolysis · 19 Energy changes · 16 Environmental pollution · 15 Kinetic theory of matter and gas laws · 18 Metals and their compounds · 23 Non-metals and their compounds · 22 Organic compounds · 29 Oxidation and reduction · 19 Rates of chemical reaction · 16 Separation of mixtures and purification · 18 Solubility · 16 Water · 18

Question 121· Chemistry and industry· WAEC
Vanadium(V) oxide is the catalyst in the manufacture of
Explanation and discussion
Question 122· Chemistry and industry· WAEC
Petroleum is refined at Port Harcourt, Warri and Kaduna by
Explanation and discussion
Question 123· Chemistry and industry· WAEC
The main component of natural gas is
Explanation and discussion
Question 124· Chemistry and industry· WAEC
In the Haber process for ammonia, the catalyst is
Explanation and discussion
Question 125· Chemistry and industry· WAEC
The Haber process manufactures
Explanation and discussion
Question 126· Chemistry and industry· WAEC
Cement is manufactured mainly from
Explanation and discussion
Question 127· Chemistry and industry· WAEC
Local black soap (ose dudu) is made by boiling palm kernel oil with
Explanation and discussion
Question 128· Chemistry and industry· WAEC
Detergents are preferred to soap in hard water because
Explanation and discussion
Question 129· Electrolysis· WAEC
During the electrolysis of dilute sulphuric acid with platinum electrodes, the gas at the anode is
Explanation and discussion
Question 130· Electrolysis· WAEC
In the purification of copper, the impure copper is made the
Explanation and discussion
Question 131· Electrolysis· WAEC
Electroplating is used to
Explanation and discussion
Question 132· Electrolysis· WAEC
To electroplate an iron spoon with silver, the spoon is made the
Explanation and discussion
Question 133· Electrolysis· WAEC
In the electrolysis of molten sodium chloride, sodium is formed at the
Explanation and discussion
Question 134· Electrolysis· WAEC
Electrolysis of concentrated brine gives at the cathode
Explanation and discussion
Question 135· Electrolysis· WAEC
Which of these is a non-electrolyte?
Explanation and discussion
Question 136· Electrolysis· WAEC
The mass of copper deposited by 0.2 mol of electrons (Cu = 64, Cu²⁺) is
Explanation and discussion
Question 137· Electrolysis· WAEC
The positive electrode in electrolysis is the
Explanation and discussion
Question 138· Electrolysis· WAEC
In the electrolysis of acidified water, the gas given off at the anode is
Explanation and discussion
Question 139· Electrolysis· WAEC
What mass of silver is deposited when 9650 C pass through silver trioxonitrate(V) solution? [Ag = 108, F = 96 500 C]
Explanation and discussion
Question 140· Electrolysis· WAEC
During the electrolysis of copper(II) tetraoxosulphate(VI) solution with copper electrodes, the anode
Explanation and discussion

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WAEC Chemistry questions

Vanadium(V) oxide is the catalyst in the manufacture of

Petroleum is refined at Port Harcourt, Warri and Kaduna by

The main component of natural gas is

In the Haber process for ammonia, the catalyst is

The Haber process manufactures

Cement is manufactured mainly from

Local black soap (ose dudu) is made by boiling palm kernel oil with

Detergents are preferred to soap in hard water because

During the electrolysis of dilute sulphuric acid with platinum electrodes, the gas at the anode is

In the purification of copper, the impure copper is made the

Electroplating is used to

To electroplate an iron spoon with silver, the spoon is made the

In the electrolysis of molten sodium chloride, sodium is formed at the

Electrolysis of concentrated brine gives at the cathode

Which of these is a non-electrolyte?

The mass of copper deposited by 0.2 mol of electrons (Cu = 64, Cu²⁺) is

The positive electrode in electrolysis is the

In the electrolysis of acidified water, the gas given off at the anode is

What mass of silver is deposited when 9650 C pass through silver trioxonitrate(V) solution? [Ag = 108, F = 96 500 C]

During the electrolysis of copper(II) tetraoxosulphate(VI) solution with copper electrodes, the anode