Physics · Chemical Reactions and Equations
Which of the following observable changes indicate that a chemical reaction has occurred? (a) Evolution of a gas (b) Formation of a precipitate (c) Change in temperature (d) Change in colour
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Only (a), (b) and (c)
- 2(a), (b), (c) and (d)✓
- 3Only (c) and (d)
- 4Only (a) and (b)
Correct answer
(a), (b), (c) and (d)
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