1. The depletion of metal parts due to the reaction between moisture and oxygen is called
2. The burning of materials in the presence of air is called
3. All physical changes are except
The method of separation used in refining crude oil is known as
. The coating of zinc on iron.
. The fraction of petroleum product used in the construction of road is
7. One of the following is made from chemicals we get from crude oil
8. In the atmosphere, carbon exists in the form of _________.
9. Which of the following factors contributes to the carbon cycle?
10. Which of the following is a principal composition of crude oil.
11. The search for crude oil and it's exploration is carried out by
12. Does pencil lead contain which of the given options?
13. Which of the given options consists of carbon?
15. A substance that cannot be separated by physical means is
16. Chemicals used in agriculture are called
17. Paracetamol is used for the treatment and prevention of
18. Chemicals which cause high degree of harmful effects are called
19. The following are non-hazardous chemicals except
20. The components of crude oil are separated in the
