Answers

2015-06-02T19:36:53+05:30
Heat will be produced that is one factor and light may be produced and change in color may take place

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2015-06-02T19:51:02+05:30
The following will denote you whether a chemical reaction has taken place.
1. Release of gas
2. formation of precipitate
3. Change in temperature
4. Change in color or odour.
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