Evidence of chemical reaction is Releasing of gasFormation of precipitationChange in temperatureAll of the above

The correct answer to this question is All of the above.

Explanation:

1. Releasing of Gas: One common evidence of a chemical reaction is the release of gas. This can often be observed when substances react and produce a gaseous product, which may be seen as bubbles or a gas escaping into the air.

2. Formation of Precipitation: A reaction may also produce a solid product that separates out from a solution, known as a precipitate. The formation of a precipitate indicates that a chemical change has occurred.

3. Change in Temperature: Additionally, chemical reactions may involve a change in temperature, either releasing heat (exothermic reactions) or absorbing heat (endothermic reactions). A noticeable temperature change is a strong indicator of a chemical reaction taking place.

Since all these points are valid evidence of a chemical reaction, "All of the above" succinctly encapsulates all possible indicators listed.