Which of the following is/are the observation that determine(s) a chemical change?
(a) Evolution of a gas
(b) Change in temperature
(c) Formation of precipitate
O Only (a)
Only (b)
Only (c)
O All (a), (b) and (c)
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Answer:
chemical change: none
as (a) can be got back my applying pressure
(b) can be got back by just changing temperatures which are easy
(c) precipitate can be got back that I already proved by the nature, that water I. water bodies and again rain..a continuous cycle..so none of them are chemical change
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