Question

e) Combustion takes place in the presence of
i. carbon dioxide.
ii. nitrogen.
iv. oxygen
iii. copper
f) The activity which shows both physical and chemical changes is
i. burning of a candle.
ii. photosynthesis by plants
iii. melting of butter,
iv. melting of ice.
Frien of iron with water and
V​

Answer 1

Answer:

Answer e :- Oxygen.

Answer f :- Burning of candle

Answer 2

1. Combustion takes place in the presence of Oxygen
2. The activity which shows both physical and chemical changes is burning of a candle.