Q. Which of the following is/are used to make soaps?
1.Mustard oil
2.Oil of Eranda
3.Seeds of Mahua plant
Choose the correct answer from below given codes:

[A] 1 only

[B] 1 and 2 only

[C] 2 and 3 only

[D] 1, 2 and 3

Answer: D

Explanation: Chakrapani discovered mercury sulphide. The credit for inventing soap also goes to him.

  • He used mustard oil and some alkalies as ingredients for making soap. Indians began making soaps in the 18th century CE.
  • Oil of Eranda and seeds of Mahua plant and calcium carbonate were used for making soap.

Source: Science NCERT