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GS Paper IUPSC Prelims 2004
Health & Medicine
Question No. 321Interactive Test Mode
00:00
+2-0.66

Q321. Consider the following statements: 1. Baking soda is used in fire extinguishers. 2. Quick lime is used in the manufacture of glass. 3. Gypsum is used in the manufacture of plaster of Paris. Which of the statements given above is/are correct?

Consider the following statements:

  1. Baking soda is used in fire extinguishers.
  2. Quick lime is used in the manufacture of glass.
  3. Gypsum is used in the manufacture of plaster of Paris. Which of the statements given above is/are correct?
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 2004 • Science and Technology

Correct Answer: Option (D) — 1, 2 and 3

Concept & Option Breakdown

Standard Reference Verified

All three statements are correct:

  1. Statement 1 is correct: Baking soda (sodium bicarbonate, NaHCO₃) reacts with acid or decomposes upon heating to release CO₂, which smothers fires.
  2. Statement 2 is correct: Quicklime (calcium oxide, CaO) acts as a chemical stabilizer (flux/network modifier) in soda-lime glass manufacturing.
  3. Statement 3 is correct: Heating gypsum (CaSO₄·2H₂O) to about 150°C yields plaster of Paris (CaSO₄·0.5H₂O).
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2004 (Q321)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — 1, 2 and 3

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Frequently Asked Questions — UPSC Prelims 2004 Q321

What is the official answer for UPSC Prelims 2004 GS Paper I Question 321 (Science and Technology)?

The official UPSC answer key for this 2004 Science and Technology (Health & Medicine) question is Option (D): "1, 2 and 3". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2004 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?

To solve Health & Medicine questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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