On his visit to a hill station in winters Ravi had to spent a night in guest house where electricity failed due to heavy snowfall. He saw the watchman keeping himself warm with a Coal fire man 'Angithi'. he requested for some coal fire for his room. The watchman provided him "Angithi" and said that in closed room it would be harmful for him. Hence he suggested him to keep that window open.
On the basis of above para give answer of following questions-
i) Name the gases released by burning Coal.
ii) Which of the above released gas is toxic in nature and why?
iii) What are the values shown by watchman?