UPSC Prelims 2005·GS1·science-and-technology·science and technology

Consider the following statements: 1. Anhydrous sodium carbonate is commonly known as baking soda. 2. Baking soda is used in fire extinguishers. 3. Bleaching powder is manufactured in Hasenclever plant. Which of the statements is/are correct?

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Last updated 23 May 2026, 3:31 pm IST
  1. A1, 2 and 3
  2. B2 and 3Correct
  3. C3 only
  4. D1 and 2

Explanation

Statement 1 is incorrect because anhydrous sodium carbonate is known as soda ash. Baking soda is the common name for sodium bicarbonate. Statement 2 is correct because baking soda reacts with acids in fire extinguishers to release carbon dioxide gas, which helps smother and extinguish the fire. Statement 3 is correct because bleaching powder is produced by the action of chlorine on dry slaked lime, a process typically carried out in a Hasenclever plant or a Bachmann plant. Since statements 2 and 3 are correct, option B is the right answer.
science-and-technology: Consider the following statements: 1. Anhydrous sodium carbonate is commonly known as baking soda. 2. Baking soda is use

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