Question

Select the correct answer from the choices A, B, C, and D which are given. Write only the letter corresponding to the correct answer.

Two solutions are added together and the new solution becomes hot. This tells you that.

• A. A gas is being produced
• B. The solutions are not soluble
• C. The physical properties are the same
• D. A chemical change is taking place.

Answer 1

The correct option is D

A chemical change is taking place.

Explanation for correct option:

Option D

Chemical change:

• A chemical change is a permanent change in which new substances are formed.
• The chemical change is permanent and cannot be reversed by a simple physical method.
• A chemical change involves an exchange of energy in the form of heat or light.
• For example, rusting of iron, burning of wood, respiration, etc.
• In this case, when two solutions are combined, the final product is generated in the form of the solution itself, which has a high temperature.
• This signifies that an exothermic reaction occurred, resulting in the emission of heat.
• Whether heat is absorbed or released from the solution determines if a chemical process is exothermic or endothermic.
• When the temperature on the product side rises, heat is emitted, which is referred to as an exothermic reaction, and when heat is absorbed and the temperature falls, it is referred to as an endothermic reaction.

Therefore, option D is correct.