Question 5
WAEC
•
2021
•
CHEMISTRY
•
essay
Question Parts
(
a
)
(i) With the aid of an equation, explain briefly why aluminium metal is not affected by air.
(
a
)
(ii) In the extraction of aluminium from bauxite, state the: (I) substance used for purifying the ore; (II) composition of the mixture electrolysed.
(
b
)
ZnO is an amphoteric oxide. Write equations to illustrate this statement.
(
b
)
(i) List three uses of sodium trioxocarbonate (IV).
(
b
)
(ii) Explain briefly why a solution of trioxonitrate (V) acid turns yellowish on storage for some time.
(
b
)
(iii) Describe briefly how trioxonitrate (V) ions could be tested for in the laboratory.
(
c
)
(i) Write balanced chemical equations for the preparation of hydrogen chloride: (I) using concentrated \( \mathrm{H}_{2} \mathrm{SO}_{4} \) (II) by direct combination of its constituent elements.
(
c
)
(ii) State one use of hydrogen chloride.
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About This Question
This is
Waec
2021
Chemistry
Question 5.
It is one of the
essay
questions from the
2021
Waec
Chemistry
examination.
The question covers
General
.