Form Three Chemistry Mid-Term Examination 2026 – Hai Secondary School
FORM THREE CHEMISTRY MID-TERM EXAMINATION 2026 – HAI
SECONDARY SCHOOL
QN
6.
(a) Iron structures like bridges and roof sheets
deteriorate quickly when exposed to outdoor environmental conditions.
(i) Define the process that occurs in this situation and
state the two essential atmospheric conditions required for the process to
occur.
(ii) Write a chemical equation for the formation of the
product of the process occurring in a(i) above.
(b) An engineer investigated methods of protecting
underground iron gas pipelines from rusting.
(i) Explain why connecting blocks of magnesium metal to
underground iron pipes prevents rusting
(ii) Contrast galvanization and painting as corrosion
protection techniques for iron materials. State one situation where painting is
preferred over galvanization.
