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9701 MCQ Solution 75
Question 75: [Inorganic > Nitrogen & Sulphur]
Which statements are reasons why sulphur dioxide is used as a food preservative?
1 It is a reducing agent and therefore an anti-oxidant. 2 It prevents alcohols forming sour-tasting acids. 3 It does not smell and therefore can be used in more than trace quantities.
1 It is a reducing agent and therefore an anti-oxidant. 2 It prevents alcohols forming sour-tasting acids. 3 It does not smell and therefore can be used in more than trace quantities.
Reference: Past Exam Paper -June 2003 Paper 1 Q35
Solution 75:
Answer: B.
Statement 1 is true; a reducing agent is oxidised itself and therefore prevents other substance from being oxidises therefore an anti-oxidant.
Statement 2 is true because it prevents alcohols from being oxidised to acid as it is an anti-oxidant
Statement 3 is false because it does have a pungent smell
Statement 2 is true because it prevents alcohols from being oxidised to acid as it is an anti-oxidant
Statement 3 is false because it does have a pungent smell
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