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GS Paper IUPSC Prelims 2014
Health & Medicine
Question No. 180Interactive Test Mode
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Q180. Which of the following is/are the example/examples of chemical change? 1. Crystallisation of sodium chloride 2. Melting of ice 3. Souring of milk Select the correct answer using the code given below.

Which of the following is/are the example/examples of chemical change?

  1. Crystallisation of sodium chloride
  2. Melting of ice
  3. Souring of milk Select the correct answer using the code given below.
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 2014 • Science and Technology

Correct Answer: Option (B) — 3 only

Concept & Option Breakdown

Standard Reference Verified

Item 1 is a physical change: Crystallization involves phase change and solute precipitation without changing the chemical identity of NaCl.

Item 2 is a physical change: Melting of ice is a phase transition from solid H₂O to liquid H₂O, with no change in chemical structure.

Item 3 is a chemical change: Souring of milk occurs due to bacterial fermentation converting lactose into lactic acid, altering the chemical composition permanently.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2014 (Q180)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — 3 only

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Frequently Asked Questions — UPSC Prelims 2014 Q180

What is the official answer for UPSC Prelims 2014 GS Paper I Question 180 (Science and Technology)?

The official UPSC answer key for this 2014 Science and Technology (Health & Medicine) question is Option (B): "3 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2014 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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