Give one example each of a chemical reaction showing the following characteristics
a) evolution of a gas
b) change of colour
c) formation of precipate
d) change of state from liquid to gas
e) change of state from gas to liquid
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a) limestone age HCL reaction ( CO2 produced )
b) when copper reacts with oxygen, CO2, H20 it's colour changes from reddish brown to green
c) reaction of silver nitrate and potassium chloride form a precipate
d) don't know
e) don't know
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