Question

Which one of the following sets of materials can be used to prepare soap? (1)
(A) Neem oil and calcium hydroxide
(B) Castor oil and sodium hydroxide
(C) Mineral oil and sodium hydroxide
(D) Neem oil and magnesium hydroxide

Answer 1

Answer:

Been oil and magnesium hydroxide

Answer 2

Castor oil and sodium hydroxide

Explanation:

To prepare soap in a laboratory, we need an acid and a base. In the options, we find sodium hydroxide, magnesium hydroxide and calcium hydroxide. Calcium and magnesium hydroxide is not preferred as it leaves scum. So let's look at the other combinations.

We have castor oil and mineral oil. Mustard oil is used for cooking. Mineral oil does not contain any fatty acids, so it is not a good option.

So the best option would be castor oil and sodium hydroxide from the given options.