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Q.

Bath soap is a mixture of :
 

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a

Potassium salts of higher fatty acids

b

 Sodium and calcium salts of higher fatty acids

c

 Potassium palmitate and sodium stearate

d

Sodium salts of higher fatty acids

answer is A.

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Detailed Solution

  • Soap is a potassium or sodium salt of fatty acid( oleic acid, palmitic acid, stearic acid). Na salt is present in washing soaps and potassium salt is present in bathing soaps. 
  • Acid provides glycerol and ester compounds which are present in animal fat(mutton tallow) and vegetable oil(fat).
  • Preparation of Soap: Animal fat or Vegetable oil (groundnut oil, caster oil etc.) if heated with sodium hydroxide(NaOH), sodium salt of fatty acid and glycerol are formed. 
  • The above process of preparing soap is called saponification.
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