give an example of a chemical reaction for each of the following a heat are produced b a change in smell takes place c a change in colour is observed d a gas is evolved
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Na + Hcl = Nacl + H2 released
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Answer:
burning of any substance like roti (chapati/bread )
Explanation:
observation....
- heat we give
- heat we givesmell is changed
- heat we givesmell is changedcolour is changed
- not reversable!
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