Yes it had been made. An example: In the process of cracking the polymeric chains.
Yes
Unleaded petrol is petrol that has not been treated with a lead compound.
Gottelieb made an engine that ran on petrol.
Petrol is somewhat man made. Oil is a natural resource but it must be refined in order to make gas or petrol from it.
A hypothesis
petrol is extracted from crude oil
Black holes (in the astronomical sense) have never been made in the laboratory.
what are the laboratory apparatus that are made up of ceramics
The metal that is commonly used in a petrol engine is mainly made of aluminum. Some are also made of cast iron.
petrol is made from the fossil fuel oil
How many radioactive elements are made only in a laboratory?
Petrol is extracted from crude oil. The question whether it is man-made or natural is therefore a grey area. The chemicals which make up petrol are natural, however it must be processed by man in order to obtain it in the form we use it.