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Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
Crude mineral oil comes out of the earth as a thick brown or black liquid with a strong smell. It is a complex mixture of many different substances, each with its own individual qualities. Most of them are combinations of hydrogen and carbon in varying proportions. Such hydrocarbons are also found in other forms such as bitumen, asphalt and natural gas. Mineral oil originates from the carcasses of tiny animals and from plants that live in the sea. Over million of years, these dead creatures form large deposits under sea­bed and ocean currents cover them with a blanket of sand and silt. As this material hardens, it becomes sedimentary rock and effectively shuts out the oxygen, thus preventing the complete decomposition of the marine deposits underneath. The layers of sedimentary rocks become thicker, and heavier. Their pressure produces heat, which transforms the tiny carcasses into crude oil in a process that is still going on today.
How does crude oil come out of the earth ?
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
Crude mineral oil comes out of the earth as a thick brown or black liquid with a strong smell. It is a complex mixture of many different substances, each with its own individual qualities. Most of them are combinations of hydrogen and carbon in varying proportions. Such hydrocarbons are also found in other forms such as bitumen, asphalt and natural gas. Mineral oil originates from the carcasses of tiny animals and from plants that live in the sea. Over million of years, these dead creatures form large deposits under sea­bed and ocean currents cover them with a blanket of sand and silt. As this material hardens, it becomes sedimentary rock and effectively shuts out the oxygen, thus preventing the complete decomposition of the marine deposits underneath. The layers of sedimentary rocks become thicker, and heavier. Their pressure produces heat, which transforms the tiny carcasses into crude oil in a process that is still going on today.
What is crude mineral oil?
The ____________ are obtained from the residual mass left during crude petroleum distillation.
Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).
একটি HCl দ্রবনের ঘনত্ব 1.20 গ্রাম/মি.লি। এই দ্রবণে 35%(W/W) HCl এসিড আছে।500 মি.লি. দ্রবণে কি পরিমাল বিশুদ্ধ HCl আছে?
পরীক্ষাগারে Na2CO3 কে HCl দ্বারা ট্রািইটেশন করতে মিথাইল -অরেঞ্জ নির্দেশক ব্যবহৃত হয়। যদি Na2CO3 এর ঘনমাত্রা 0.125M এবং এর 10ml কে ট্রাইটেমন করতে 16ml HCl প্রয়োজন হয়, তাহলে HCl এর ঘনমাত্রা কত হবে?
Partial reduction of phenyl cyanide with stannous chloride and passing dry HCl gas in ether solution followed by hydrolysis of the aldimine stannic chloride with water to form benzaldehyde is called as which of the following method of preparation of benzaldehyde?
The import of crude oil and petroleum done from national oil companies of producer countries, which have a net exportable surplus of oil is by
At what temperature does acetylene reacts with dry hydrogen chloride in a multi tubular reactor packed with mercuric chloride catalyst, supported over activated carbon, to produce vinyl chloride?
Which of the following is not an impurity generally present in crude metals?