Describe the following substances with one suitable example of each type : (3 marks)
(i) Non-ionic detergents
(ii) Food preservatives
(i) Non-ionic detergents :These are esters of high molecular mass alcohols obtained by reaction
between polyethylene glycol and steric acid.
(ii) Food preservatives : They are used to prevent spoulage of food due to microbial growth.
Example : Table salt, vegetable oils, sodium benzoate etc.
(iii) Disinfectants : Disinfectants are chemical compounds which kill microorganisms but are not
safe when applied on living organisms.
Example : Phenol, chlorine.