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Chemistry CBSE Live product
Class 7 (2025-26)
Changes around us: Physical and chemical changes
Revision I - Physical and chemical changes
4.
Combustion
Question:
2
m.
Choose
the correct answer:
Burning of a magnesium ribbon
1.
Which of the following is essential for combustion?
Oxygen
Hydrogen
Carbon dioxide
Nitrogen
2.
Why does the combustion process is always grouped under chemical change?
Temporary and no new substance
Reversibility and produces new substance
Irreversibility and no formation of new substance
Irreversibility and formation of new substance
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