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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Chemistry in Everyday Life

NTA Abhyas 2020 · Chemistry · Chemistry in Everyday Life

Sodium sulphite is used in preserving squashes and other mildly...

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

K2S2O5→K2SO3+SO2{K}_{2}{S}_{2}{O}_{5} \to {K}_{2}S{O}_{3} + S{O}_{2}

SO2+H2O→H2SO3S{O}_{2} + {H}_{2}O \to {H}_{2}S{O}_{3}

SO2S{O}_{2} and sulphurous acid (H2SO3)\left({H}_{2}S{O}_{3}\right) kill the bacteria and prevent the decay of food.
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