Q

Consider the below statements and identify the correct answer. Statement-I: Anhydrous sodium carbonate is used in soda-acid fire extinguishers. Statement-II: Anhydrous sodium carbonate is dissolved in water and recrystallized to get washing soda crystals containing 10 molecules of water of crystallisation.

RRB Group D, 17-Aug-22 S-2 2022
✓ Answer: D Statement-II is true, and Statement-I is false.
Statement I is incorrect because anhydrous sodium carbonate is not used in soda-acid fire extinguishers; sodium bicarbonate (baking soda) is used instead. Statement II is correct as anhydrous sodium carbonate is dissolved in water and recrystallized to produce washing soda crystals (sodium carbonate decahydrate) containing 10 molecules of water of crystallization.
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