Question

Which of these given options is not a chemical change?

• A. Burning of Paper
• B. Photosynthesis
• C. Digestion of food
• D. Breaking of glass

Answer 1

The correct option is D Breaking of glass

Burning of paper is a chemical change because after burning it gets converted into ashes. Here the conversion is from cellulose to carbon dioxide and the chemical composition changes.
During photosynthesis, carbon dioxide, water and sunlight combine in the presence of chlorophyll to form glucose and oxygen. As new products are formed it is a chemical change. The process of digestion is a chemical change. The food we intake contains carbohydrates, protein, water and glucose and these get converted into new substances during digestion. But the breaking of glass converts the glass piece into smaller pieces and the chemical composition does not change here. Hence, it is a physical change.