. What are the following substances? Give one example of each.
Ans.(i)Food preservatives: They are used to prevent spoilage of food due to microbial growth.
Example: Table salt, vegetable oils, sodium benzoate etc.
(ii)Synthetic detergents: Synthetic detergents are cleansing agents which have all the properties of soap but which actually do not contain any soap.
Example: Sodium lauryl sulphate (or any one other)
The substances which neutralize the excess acid and raise the pH to an appropriate level in the stomach are called antacids.
Example: Sodium bicarbonate, Ranitidine etc.