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Question


Which of the following changes indicate that a chemical change has taken place?


A

Absorption or release of heat

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B
Change in colour
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C

Evolution of gas

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D

All of the above

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Solution

The correct option is D

All of the above


A chemical change is a permanent change in which new substances are formed that are entirely different from the original substance.

It is usually accompanied by:

  • Change in colour

  • Formation of new substance

  • Evolution of gas

  • Release or absorption of energy in the form of heat, light, or sound.


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