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DDT is non biodegradable substance and bio degradable means those substance can the ability to remove
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biodegradable substance easily decompose naturally like fruit peels, dead plant.Non biodegradable substance can not be degraded naturally
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Q3)Biodegradable substances are those that degrades or break down naturally.
Non-biodegradable substances are those that do not degrade easily.
Q4) Rust is an iron oxide, a usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.
Condition Necessary For Rusting Of Iron:-
(i) The presence of water and oxygen is essential for the rusting of iron.
(ii) Impurities in the iron, the presence of water vapor, acids, salts and carbon dioxide hastens rusting.
(iii) Pure iron does not rust in dry and carbon dioxide free air.
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