(c)[2]
State two characteristics of CFCs that made them suitable for use as aerosol propellants.
(d(i))
In the upper atmosphere, CFCs can undergo homolytic fission in ultraviolet light. What is meant by homolytic fission?
(d(ii))[2]
Suggest an equation showing homolytic fission of $\text{CCl}_2\text{F}_2$.
(e)[1]
Hydrocarbons such as propane and butane are now the most common substitutes for CFCs as aerosol propellants. Suggest one disadvantage of using these compounds as aerosol propellants.
(a)[1]
What compound is $\text{NaX}$?
(b)[1]
Which gas, apart from $\text{HX}$, would be produced if concentrated sulfuric acid were used with $\text{NaX}$ rather than phosphoric(V) acid?