Question

13 The various impusities
of coal are
(a) sulpher (6) Nitrogen oxide​

Answer 1

Answer:

(6) nitrogen oxide is the correct answer

Answer 2

Other impurities are nitrogen and sulphur that are chemically reduced during coalification to the gases ammonia (NH4) and hydrogen sulphide (H2S), which become trapped within the coal. However, most sulphur is present as the mineral pyrite (FeS2), which may account for up to a few per cent of the coal volume