2009 · Q120
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.
General KnowledgeChemistry
- ABoth A and R true; R explains A
- BBoth A and R true; R does not explain A
- CA true but R false
- DA false but R true
Explanation
Both are true and the insolubility (R) explains the lack of lather (A).