Question 5
WAEC
•
2022
•
CHEMISTRY
•
essay
Question Parts
(
a(i)
)
Describe the observation that would be made when: (i) sulphur is heated from room temperature till 119°C; (ii) \( 50 \% \) trioxonitrate (V) acid acts on copper tunings.
(
b(i)
)
State two gaseous pollutants that can be generated by burning coal.
(
b(ii)
)
What gas is responsible for most of the explosions in coal mines?
(
b(iii)
)
The mining of coal leads to environmental pollution. State two environmental effects of the mining activity.
(
b(iv)
)
Explain briefly why coal burns more easily when it is in pieces than in lump form.
(
b(v)
)
Name the non-volatile residue after the destructive distillation of coal.
(
c(i)
)
Describe a chemical test for water.
(
c(ii)(i)
)
State the effect of: (i) boiling a temporary hard water; (II) adding sodium trioxocarbonate (IV) crystals to permanent hard water.
(
c(iii)
)
Write an equation for the process in 5c(ii)(I).
(
d
)
With the aid of a labelled diagram, describe briefly the laboratory preparation of oxygen gas.
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About This Question
This is
Waec
2022
Chemistry
Question 5.
It is one of the
essay
questions from the
2022
Waec
Chemistry
examination.
The question covers
General
.