choose the right answer.
2. Which of the following is a chemical reaction brought about by heat?
a) Combustion of methane
b) Decomposition of water
c) Rusting of iron
d) Sublimation of dry ice
3. Which of the following is a chemical change?
a) Dissolving of sugar
b) Sublimation of iodine
c) Electrolysis of water
d) Boiling of water
4. Burning of fossil fuel produces:
a) Oxygen
b) Helium
c) Carbon dioxide
d) Ozone
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Answer:
in first option a is correct
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