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?

Statement 1 is incorrect: anhydrous sodium carbonate is commonly called soda ash or washing soda, not baking soda, which is sodium hydrogencarbonate (sodium bicarbonate) [1]. Statement 2 is correct: baking soda (sodium hydrogencarbonate) is used in fire extinguishers (it releases CO2 on heating and is used in some soda-acid and dry chemical extinguishers) [2]. Statement 3 is correct in principle: bleaching powder is produced by passing chlorine over slaked lime (Ca(OH)2), the established manufacturing reaction for bleaching powder; the Hasenclever plant historically refers to the equipment/plant used for this chlorine–lime process, so bleaching powder manufacture is associated with that setup [3]. Therefore, statements 2 and 3 are correct.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > Uses of washing soda > p. 32
2. [2] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > Uses of Baking soda > p. 31
3. [3] https://www.cec-ugc.nic.in/webpath/curriculum/Module/APPIC/Paper02/27/downloads/script.pdf