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UPSC 2002: Assertion (A): Synthetic detergents can lather well in hard water. Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water.
(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is not a correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
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Not attemptedCorrect Answer: (a) Both A and R are individually true and R is the correct explanation of A
Synthetic (alkyl–benzene sulphonate) detergents do not precipitate with Ca²⁺/Mg²⁺ ions; instead they form soluble salts, so their micelles remain intact and abundant lather is produced. Both statements are correct and the reason precisely explains the assertion. ([civilserviceindia.com](https://www.civilserviceindia.com/upsc_questions/GeneralStudies-2002%28pre%29.html))
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Frequently Asked Questions
What is the correct answer to this UPSC 2002 Science & Technology question?▼
The correct answer is option (a): Both A and R are individually true and R is the correct explanation of A. 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 2002, GS Paper 1, as Question 145. 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.