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Physics CBSE Live product
Class 7 (2026-27)
Changes around us: Physical and Chemical
Rusting and Combustion
2.
TBQ - Examples of combustion and rusting
Question:
4
m.
Fill in the blanks:
1.
A chemical process in which a substance reacts with oxygen and produces heat and light is called
sublimation
combustion
freezing
rusting
,and it is a
chemical
physical
freezing
reversible
change.
2.
Rusting of iron requires
heat and light
nitrogen and helium
oxygen and water
oxygen and moisture
, and it is a
freezing
reversible
physical
chemical
change.
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