D.
Give a chemical reaction for each of the following characteristics:
1. Evolution of a gas :
2.
Change of colour :
3. Formation of precipitate:
4.
Change in physical state:
5.
Change in energy:
Give a chemical reaction for each of the following characteristics:
1. Evolution of a gas :
2.
Change of colour :
3. Formation of precipitate:
4.
Change in physical state:
5.
Change in energy:
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