Assertion (A) >: Soaps do not form lather with water containing salts of calcium and magnesium. Reason (R) >: Calcium and magnesium salts of long-chain fatty acids are insoluble in water.

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Q: 91 (CDS-I/2009)

Assertion (A): Soaps do not form lather with water containing salts of calcium and magnesium.
Reason (R): Calcium and magnesium salts of long-chain fatty acids are insoluble in water.
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,27,16,27,6,6,4

keywords: 

{'soaps': [0, 0, 1, 2], 'lather': [0, 0, 0, 1], 'magnesium salts': [0, 0, 2, 1], 'fatty acids': [0, 0, 1, 0], 'salts': [0, 0, 2, 0], 'calcium': [2, 0, 0, 4], 'magnesium': [1, 0, 2, 3], 'water': [65, 15, 80, 129]}