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UPSC 2014: Which of the following is/are the example/examples of chemical change? 1. Crystallization of sodium chloride 2. Melting of ice 3. Souring of milk Select the correct answer using the code given below.
(a)1 and 2 only
(b)3 only
(c)1, 2 and 3
(d)None
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Not attemptedCorrect Answer: (b) 3 only
A chemical change produces a new substance. Crystallization of sodium chloride and melting of ice only change physical state; the chemical identity (NaCl and H₂O) remains the same. Souring of milk involves lactic-acid fermentation that alters milk’s chemical composition, so only statement 3 is a chemical change. ([edukemy.com](https://edukemy.com/blog/upsc-prelims-2014-question-70/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2014 Science & Technology question?▼
The correct answer is option (b): 3 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 2014, GS Paper 1, as Question 70. It falls under Science & Technology > Chemistry.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
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.