ICSE 1998 : SCIENCE Paper 2 (Chemistry) - Question 6(b) Answer the following.

SCIENCE
Paper 2 (Chemistry) - 1998
(One hour and a half)

Question 6
(b) Ethane burns completely in air or oxygen to give carbon dioxide (and water vapour). With a limited supply of air/oxygen, carbon monoxide is formed. The same gases are found in automobile exhaust gases. Both gases can be considered as atmospheric pollutants.

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70.
(i) Write the equation for the complete combustion of ethane.

71.
(ii) What danger is associated with carbon monoxide?

72.
(iii) What effect is associated with too much carbon dioxide in the atmosphere?

73.
(iv) Burning acetylene (ethyne) in oxygen under appropriate conditions produces a very hot flame. What is the hot flame used for?

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