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Question

Hard soap is a  salt whereas soft soap is a salt of fatty acids.
  1. sodium
  2. potassium
  3. flouride
  4. sulphur


Solution

The correct options are
A sodium
B potassium
Soap is a sodium or potassium salt of fatty acids which have cleansing property in water.
Sodium soaps are called hard soaps and potassium salts are called soft soaps.
Hard soap is moderately soluble in water and does not produce lather easily. Whereas, soft soap dissolves faster and produces lather readily.
Soft soap performs better cleansing action than hard soaps.
Hard soaps are used for washing, whereas soft soaps are used for bathing.

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