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UPSC 2005: 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 given above is/are correct?
(a)1, 2 and 3
(b)2 and 3
(c)3 only
(d)1 and 2
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Not attemptedCorrect Answer: (b) 2 and 3
Anhydrous sodium carbonate is washing soda, not baking soda (so statement 1 is false). Sodium bicarbonate (baking soda) releases CO₂ and is the main agent in BC dry-chemical fire extinguishers (statement 2 true). Bleaching powder is industrially produced by reacting chlorine with slaked lime in plants such as the Hasenclever plant (statement 3 true). Thus only statements 2 and 3 are correct (option b). ([en.wikipedia.org](https://en.wikipedia.org/wiki/Sodium_bicarbonate?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2005 Science & Technology question?▼
The correct answer is option (b): 2 and 3. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Chemistry question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2005, GS Paper 1, as Question 16. It falls under Science & Technology > Chemistry.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Chemistry?▼
UPSC has asked 53 questions from Chemistry (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.