1.

2. Coal is mainly composed of(a) oxygen(b) carbon dioxide3. Petroleum is a mixture of(a) hydrocarbons(b) gases(c) carbon(c) rocks and soil

Answer»

answer(2)---opction (c) is correct answer .answer(3)--- option (b) is correct answer.

2) carbon3) hydrocarbons

2 answer - Carbon 3 answer - Hydrocarbons



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