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NTA Abhyas JEE Main2020ChemistryChemistry in Everyday LifePractice

Sodium sulphite is used in preserving squashes and other mildly acidic foods due to

Options

  1. APotassium salt has preservative action
  2. BPotassium metabisulphite prevents oxidation
  3. CPotassium metabisulphite is not influcenced by acid
  4. DSulphur dioxide and sulphurous acid formed kill bacteria and germs

Correct answer

D. Sulphur dioxide and sulphurous acid formed kill bacteria and germs

Step-by-step solution

K 2 S 2 O 5 → K 2 S O 3 + S O 2 S O 2 + H 2 O → H 2 S O 3 S O 2 and sulphurous acid H 2 S O 3 kill the bacteria and prevent the decay of food.

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