i. Coke was used in manufacture of steel.
Reason: used to strengthen the pure iron used in steel
ii. The bi product of coal used in synthetic dyes and paints is coal tar.
Reason: informative question. Information in book.
iii. Coal was formed in areas where large amounts of Vegetation was buried under the earth.
Reason: vegetation buried for very long time (millions of years) face extremely high temperature and pressure and gives coal.
iv. Carbon di oxide gas which causes climate change and global warming.
Reason: carbon di oxide traps sun ’s heat and increases the temperature of the earth. This is what global warming is.
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