Properties and uses of different kinds of steel
2 marks · HardA food processing factory needs to choose a type of steel for making storage tanks that will contain acidic liquids. State which type of steel is most suitable and explain why, giving one property that supports your answer.
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Stainless steel; it is very resistant to corrosion and does not react with acids.
Also accept: Stainless steel because it does not corrode / is corrosion resistant; Stainless steel is resistant to acids; Stainless steel is unreactive to acidic liquids
Common mistakes: Choosing mild steel (which would rust); Omitting the property that relates to resistance to acid
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Identifies stainless steel as most suitable.
B2 · 1 mark · Explains a supporting property for the choice (e.g., resistant to corrosion or acids).
Worked solution
Stainless steel is the most suitable type because it is highly resistant to corrosion and does not react with acidic liquids.