1) Clean coal technology describes new electricity generation processes that are expected to have high efficiencies, be able to minimise environmental impacts, including SO₂, NOx and CO₂ emissions from coal fired power plants. Illustrate, with the aid of diagrams,  
i)  One of sulphur dioxide control technologies;
ii)  One of NOx reduction technologies;
iii) Two of carbon capture and storage (CCS) technologies.
 
(Note: the impact on technical performance and costs due to various emission control technologies should be discussed).