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JIPMER 2015
Exam
JIPMER
Year
2015
Subject
Chemistry
Chapter
Chemistry in Everyday Life

JIPMER 2015 · 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

K2 S2O5 K2SO3+SO2SO2+H2O⟶H2SO3\begin{aligned} & \mathrm{K}_2 \mathrm{~S}_2 \mathrm{O}_5 \mathrm{~K}_2 \mathrm{SO}_3+\mathrm{SO}_2 \\ & \mathrm{SO}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{H}_2 \mathrm{SO}_3\end{aligned}\mathrm{SO}_2andsulphurousacidand sulphurous acid\left(\mathrm{H}_2 \mathrm{SO}_3\right)$ kill the bacteria and prevent the decay of food.
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