4. Give one example of each :
(a) Chemical reaction showing evolution of gas.
(b) Change in substance's colour during a chemical reaction.
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1
Explanation:
chemical reaction showing evolution of gas. (b) change in substance's colour during a chemical reaction. ... In the above reaction, Zn replaces H from HCl as Zn is more reactive than H. Hydrogen after getting displaced by Zn will be evolved as H2 in gaseous form.
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Answer:
(I) reaction of dil
(II) copper reaction with oxygen
Explanation:
(I) sulphur acid with zinc granules
(II) colour changes from brown to blue
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