Please answer this source based question

Dear student, 
a. The name of the process is corrosion. Acid rain consist of certain acid pollutants which are present in rain water in the form of clouds such as sulphur and nitrogen. These pollutant nitrogen oxides and sulphur oxide fall on the surface of the marble of Taj Mahal.The marble contain limestone consist of certain minerals react with substances water to form yellow colour on the surface and destroy the marble to for a powdery substance.
b. Acid makes the white marble yellow. 
c. The name of the process is rusting. Corrosion of Iron in the presence of oxygen and air leads to formation of brown solid known as rust. 
 
4Fe + 3O2+ 2xH2O → 2Fe2O3.xH2O
d. Methods of protecting iron from rusting

Galvanization: It is the process of coating the iron object with a protective layer of Zinc, which gets oxidized but prevents rusting of iron.
Painting the iron object: this prevents the surface of the iron object to get oxidized by coming in contact with moisture.
Regards

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3 a) the process is rusting
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3. (a) rusting (corrosion)
(b) acids
(c) corrosion.
4Fe+3O2+x.H2O--->2Fe2O3.xH2O
(d) applying a coat of paint and controlling air pollution
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1. Corrosion
2. Acid
3.
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