Question

Which of the following is a sign of chemical reaction?

• A. Change in the colour of the substance.
• B. Absorption of heat.
• C. Evolution of light and sound.
• D. All of above.

Answer 1

The correct option is D All of above.

The process of combination of different atoms to form different products is known as chemical reaction.

Chemical reaction involves a change in the physical and chemical properties like change in the colour of the substance, change in the state of the substance, change in heat energy, absorption of energy or release of energy, release of gas, evolution of light and sound.