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Main pollutant present in automobile exhaust is

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In a Carbonyl group a carbon atom makes double bond with Which one of the following has highest volatility_________________? Elements in any common group are similar. 'A'n' 'a'c'i'd' 'i's' 'a' 's'u'b's't'a'n'c'e' 'w'h'i'c'h' '1'.' 'i's' 's'o'u'r' 'i'n' 't'a's't'e'.' '2'.' 't'u'r'n's' 'r'e'd' 'l'i't'm'u's' 'p'a'p'e'r' 'i'n't'o' 'b'l'u'e'.' Assertion (A) Hydrocarbons are very good fuels. Reason (R) The main sources of hydrocarbons are natural gas, petroleum and coal.