Waec Model Questions Vol1 2022 Chemistry Question 24
Practice objective / multiple choice question 24 from the 2022 Waec Model Questions Vol1 Chemistry examination.
A steel pipeline (external diameter 200 mm, wall thickness 10 mm) is to be protected by galvanising with a zinc coating. In the soil the corrosion rate of zinc is 0.025 mm yr⁻¹ for the first 5 years and then increases by 20 % for the remaining period. The corrosion rate of steel, if exposed, would be 0.15 mm yr⁻¹. Determine the minimum thickness of zinc coating required so that the steel does not become exposed for at least 20 years. Give your answer in millimetres, rounded up to two decimal places.
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About This Question
This is Waec Model Questions Vol1 2022 Chemistry Question 24. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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