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2016-02-28T11:19:06+05:30
nitrogen and sulphur..........
are two elements present in coal and petroleum besides carbon

2 5 2
ok i marked
wht..!!
u mrked sm1 elses
:(
thanks
The Brainliest Answer!
2016-02-28T11:19:44+05:30
Nitrogen & sulphur .
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