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UPSC 2006: Consider the following chemicals: 1. Benzene 2. Carbon tetrachloride 3. Sodium carbonate 4. Trichloroethylene Which of the above is/are used as dry-cleaning chemicals?
(a)1 only
(b)2 only
(c)1, 2 and 4 only
(d)1, 2, 3 and 4
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Not attemptedCorrect Answer: (c) 1, 2 and 4 only
Traditional dry-cleaning has used aromatic or chlorinated solvents such as benzene, carbon tetrachloride and trichloroethylene; all three are listed as former or spot-cleaning solvents in dry-cleaning history ([en.wikipedia.org](https://en.wikipedia.org/wiki/Dry_cleaning?utm_source=openai)). Sodium carbonate (washing soda) is a water-soluble alkali, not an organic solvent, and is not employed for dry-cleaning. Therefore chemicals 1, 2 and 4 only are relevant, giving option (c).
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Frequently Asked Questions
What is the correct answer to this UPSC 2006 Science & Technology question?▼
The correct answer is option (c): 1, 2 and 4 only. 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 2006, GS Paper 1, as Question 5. 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.