Hydrocarbons are also used in cosmetics in the form of …………..
a) waxes
b) petroleum jelly
c) both a & b
d) none of these
………..are also used in the preparation of detergents and surfactants.
a) hydrocarbons
b) noble gases
c) metals
d) non-metals
A number of useful chemicals obtained from hydrocarbons are ……….
a) methyl alcohol
b) acetic acid
c) choroform
d) all of these
