Science — AI-generated practice question

Curd and sour substances contain acids. When stored in brass or copper vessels, these acids react with the metals (copper/zinc in brass) to form harmful salts (metal salts), which can be toxic if consumed. This contaminates the food and may cause food poisoning.

Source: Chapter 3, Metals and Non-metals

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• The key idea is acid + metal reaction: acidic foods react with copper/zinc to form poisonous compounds.
• Examiners expect: (1) statement that curd/sour substances are acidic, (2) they react with copper/brass, (3) forming harmful/toxic products.
• This question links Chapter 1 (acids react with metals) with Chapter 3 (properties of metals). Keep it concise — two clear points earn full 2 marks.