answer in one word or sentence .
1. what is acid rain .
2. what is oxidation .
3. which gas is non supporter of combustion . 
4. which substance produce flame .
5. name the pollutants which are produce durning combustion .
6. name two green house gases .

Dear student,

1) Acid rain is rainfall that has been acidified. Rain is acidified by oxides of sulfur and nitrogen. Acid rain usually has a pH of less than 5.6. It is formed when pollutants called oxides of sulfur and nitrogen, present in factory smoke, and car exhaust, react with the moisture in the atmosphere.

2) Oxidation is a process in which there is-
- An increase in oxidation no.
- Removal of hydrogen
- Addition of oxygen.
- Addition of electronegative element
- Removal of electropositive element
- Removal of electrons.

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