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Which of the following is not an indication of a chemical reaction?


1.) Heat is generated when two substances are combined.

2.) A solid quickly forms when two liquids are combined.

3.) A substance melts when sitting in the Sun.

4.) A substance sours when sitting in the Sun.

Verified Answer :

Answer: Option (3) is the correct answer.

Explanation:

A reaction due to which there occurs change in chemical composition of reactants is known as a chemical reaction.

For example, evolution of heat when two substances combine together shows a chemical reaction has taken place between the substances.

Whereas a reaction which does not bring any changes in chemical composition of the reactants is known as a physical reaction.

For example, boiling point, melting point, mass, volume etc are all physical properties.

Thus, we can conclude that out of the given options a substance melts when sitting in the Sun, is not an indication of a chemical reaction.

Answer:

A substance melts when sitting in the Sun.

Explanation: