Which is not an indicator of chemical reaction?

Change in mass

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Change in colour

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Change in state

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Change in temperature

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Solution

The correct option is A Change in mass
The occurrence of a chemical reaction is indicated by various factors like change in colour, state, temperature or evolution of gas, etc. During a chemical reaction, mass remains constant. According to the law of conservation of mass, mass can neither be created nor be destroyed in a chemical reaction.

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