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WBCS Preliminary Examination 2018 — General Studies · Question 111 of 200

Q111
General ScienceChemistry
Chemical name of vinegar is
  1. a.sodium nitrate
  2. b.dilute acetic acid
  3. c.chloride of lime
  4. d.calcium

Answer: (B) dilute acetic acid

Vinegar is a 5-8 per cent solution of acetic acid (ethanoic acid, $CH_3COOH$) in water; pure acetic acid is called glacial acetic acid because it freezes into ice-like crystals. The other options: sodium nitrate is Chile saltpetre (a fertiliser), chloride of lime is bleaching powder, and calcium is a metal. Acids in foods: citric (lemon), lactic (curd), tartaric (tamarind), oxalic (spinach, tomato).

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