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The compound obtained by heating a caustic soda solution with linseed oil can be used as a
1. Fuel
2. Fertilizer
3. Plastic
4. Soap

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Correct Answer - Option 4 : Soap

The correct answer is Soap.

The compound obtained by heating a caustic soda solution with linseed oil can be used as a Soap.

  • Soaps are Sodium or Potassium salts of fatty acids.
    • They are made from fats or oils.
    • The process of making soaps is known as Saponification.
  • Formula- Soap contains a negatively charged ion of fatty acid (looks like C17H35COO-) and the positively charged ion of either Sodium (Na+) or Potassium (K+).
  • The fatty acid ion is known as the tail of the soap molecule and sodium or potassium ion is known as the head of the soap molecule
    • So the formula becomes C17H35COONa ( fatty acid in the composition can change)
  • These are also known as stearates of sodium or potassium. 
  • They fall into the category of salts.

  • Hard soaps are made using Sodium hydroxides.
    • They are manufactured by the hot process of saponification.
    • In the hot process, hot oils and lye are combined to initiate saponification.
  • Soft soaps are made using Potassium hydroxide.
    • They are manufactured by the cold process of saponification.

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