Which of these is not an indicator of a chemical reaction. question 7 options: change in color production of heat, cold or light precipitation of a solid change of state

I'm not 100% on the answer but I do know that it is either B.) Production of heat,cold or light. or C.) Precipitation of a solid. I know that when a chemical reaction happens that change in color and change in state (new substance) happens. I hope this helps you figure it out.

Ithink the answer is a or d.