Directions: Write true if the statement is correct and false if it is
wrong.
1. Iron when combined with oxygen form rust.
2. Oxygen does not have any effect on materials.
3. Rusting is caused by reaction of iron with oxygen present in air.
4. Combustion refers to the process where materials burn due to presence of
heat and oxygen.
5. When an apple is cut, the fleshy part of the fruit did not change its color.


Answer:
1.true
2.false
3.false
4.true
5.false
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