In which type of reaction is energy actively absorbed?

• A. Exothermic reaction
• B. Neutralization reaction
• C. Endothermic reaction
• D. Redox reaction

Answer: (C)

In an endothermic reaction, energy is actively absorbed from the surroundings, usually in the form of heat. This process results in the products of the reaction having higher energy than the reactants because the reaction requires a continuous input of energy to proceed. As a result, the temperature of the surroundings can drop, indicating that energy is being taken in.

This type of reaction contrasts with exothermic reactions, where energy is released, and neutralization reactions, which often can either release or absorb energy depending on the specific reactants involved. Redox reactions, which involve the transfer of electrons, can also be either exothermic or endothermic, depending on the particular reaction and the energy changes involved. Therefore, endothermic reactions specifically highlight the concept of energy absorption, making it the correct answer in this context.