The correct answer is 2 and 3.
Statement 1 is incorrect. Anhydrous sodium carbonate is commonly known as soda ash or washing soda, not baking soda. Baking soda is actually sodium bicarbonate (NaHCO3).
Statement 2 is correct. Baking soda (sodium bicarbonate) is used in some fire extinguishers as it can release carbon dioxide when heated, which helps smother the fire by displacing oxygen.
Statement 3 is correct. Bleaching powder is indeed manufactured in Hasenclever plant, which is a common method for producing this chemical compound.