Crude petroleum contains impurity of —

এই অধ্যায়ের আরও প্রশ্ন

• C-08-Q156Refining of crude oil is done by —
• C-08-Q157Crude oil is refined by heating at about —
• C-08-Q158Major part of petroleum is used as —
• C-08-Q159Diesel engines use petroleum for purposes including —
• C-08-Q160Petroleum is also used in industry for —
• C-08-Q161Coal is a —
• C-08-Q162The main chemical element in coal is —
• C-08-Q163Besides carbon, coal contains variable amounts of —
• C-08-Q164Coal was formed from —
• C-08-Q165Coal was formed about how long ago?