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GS Paper IUPSC Prelims 2006
Health & Medicine
Question No. 348Interactive Test Mode
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+2-0.66

Q348. Consider the following chemicals: 1. Benzene 2. Carbon tetrachloride 3. Sodium carbonate 4. Trichloroethylene Which of the above/is are used as dry cleaning chemical?

Consider the following chemicals:

  1. Benzene
  2. Carbon tetrachloride
  3. Sodium carbonate
  4. Trichloroethylene Which of the above/is are used as dry cleaning chemical?
Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2006 • Science and Technology

Correct Answer: Option (C) — 1, 2 and 4 only

Concept & Option Breakdown

Standard Reference Verified
  • Benzene, Carbon tetrachloride ($CCl_4$), and Trichloroethylene (TCE) are non-polar organic solvents that have been used as dry cleaning solvents to dissolve grease and oils.
  • Sodium carbonate (washing soda) is a water-soluble inorganic salt used in wet laundering, not dry cleaning.
Elimination Heuristic & Exam Approach

Dry cleaning uses non-polar organic solvents that do not require water. Sodium carbonate (washing soda) is an inorganic salt used in wet laundry washing, so eliminating 3 leaves only (c).

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2006 (Q348)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — 1, 2 and 4 only

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Frequently Asked Questions — UPSC Prelims 2006 Q348

What is the official answer for UPSC Prelims 2006 GS Paper I Question 348 (Science and Technology)?

The official UPSC answer key for this 2006 Science and Technology (Health & Medicine) question is Option (C): "1, 2 and 4 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2006 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

Dry cleaning uses nonpolar organic solvents that do not require water. Sodium carbonate (washing soda) is an inorganic salt used in wet laundry washing, so eliminating 3 leaves only (c).

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