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Q.9 .Why are carbon and its compounds used as fuels in most cases?    [U+Av ]
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               Q10Give reasons for the following:
               (i)Element carbon forms compounds mainly by covalent bonding.
               (ii)Diamond has a high melting point.
               (iii)Graphite is a good conductor of electricity.
               (iv)Acetylene bums with a sooty flame.
               (v)Kerosene does not decolourise bromine water while cooking oils do.


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