Which of the following is typical of an endothermic reaction?
the reaction container is warm.
the reaction container is cold.
light is a product of the reaction.
sound is a product of the reaction.

The correct option is - The reaction container is cold.

Explanation: Endothermic reaction is a reaction in which the system absorbs energy from the surroundings, generally in the form of heat.

In this process, the surrounding becomes cold after loosing energy.

And here, the surrounding is reaction container and hence, will become cold by loosing its energy to the reaction mixture.