7. Chemical changes are
(a) temporary, reversible and a new substance is
produced
(b) irreversible, permanent and a new substance
is produced
(c) always accompanied by exchange of light
(d) never accompanied by exchange of light and
heat energy
Answers
Answered by
4
Answer:
ans -b. Irreversible permanent and a new substances produced
Explanation:
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Answered by
3
option a is rhe correct option
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