Which of the following kitchen chemicals is commonly used to preserve pickles?

Correct option is A

The correct answer is (a) Vinegar
Explanation:
• Vinegar (acetic acid solution) preserves pickles by creating an acidic environment that inhibits microbial growth.
• Common household preservative for pickles and chutneys.
• Works with salt and oil to extend shelf life and flavour.
• Acidification prevents spoilage and pathogenic bacteria.
• Widely used in home and commercial pickle-making.
Information Booster:
• Salt, oil and refrigeration also contribute to preservation.
Additional Knowledge:
(b) Baking soda — a base; not used for preservation.
(c) Yeast — used for fermentation, not direct preservation.
(d) Sugar — used for jams/jellies, not typical for pickles.