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Question

Consider the following two statements about soap and detergent –
(i) Soaps and detergents are salts of long chain fatty acids.
(ii) Both soap and detergent precipitate scum in hard water.
(iii) Soap is sodium or potassium salt of fatty acids whereas detergents are ammoniuma nd sulphonate salts of fatty acids.
Which of the above statements is (are) true?

A
(i) and (ii)
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B
(ii) and (iii)
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C
(iii) and (i)
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D
All
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Solution

The correct option is C (iii) and (i)

Soap forms scum with hard water but detergent does not form any scum. Hence statement (ii) is incorrect.


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