An example of physical change is:
An example of physical change is:
The correct option is A magnetisation of iron
Explanation for correct option:
(A) Because there is no change of state, temperature, smell, or gas development, the magnetization of iron is a physical rather than a chemical change. It is due to the fact that there is no chemical process involved. The iron will lose its magnetic power after it has been demagnetized. So, this is the correct option.
Explanation for incorrect option:
(B) When wood is burned, new substances such as ash (carbon), carbon dioxide gas, water vapour, heat, and light are produced. This is a chemical alteration since it is irreversible.
(C) Photosynthesis is the conversion of light energy into chemical energy by plants. The chemical process is as follows: water and carbon dioxide react to produce glucose and oxygen. Photosynthesis is certainly a chemical change since new chemical species are produced.
(D) Food digestion is considered a chemical change because enzymes in the stomach and intestines break down large macromolecules into simpler molecules so that the body can more easily absorb the food.
Thus, option (A) is the correct answer.
magnetisation of iron
Explanation for correct option:
(A) Because there is no change of state, temperature, smell, or gas development, the magnetization of iron is a physical rather than a chemical change. It is due to the fact that there is no chemical process involved. The iron will lose its magnetic power after it has been demagnetized. So, this is the correct option.
Explanation for incorrect option:
(B) When wood is burned, new substances such as ash (carbon), carbon dioxide gas, water vapour, heat, and light are produced. This is a chemical alteration since it is irreversible.
(C) Photosynthesis is the conversion of light energy into chemical energy by plants. The chemical process is as follows: water and carbon dioxide react to produce glucose and oxygen. Photosynthesis is certainly a chemical change since new chemical species are produced.
(D) Food digestion is considered a chemical change because enzymes in the stomach and intestines break down large macromolecules into simpler molecules so that the body can more easily absorb the food.
Thus, option (A) is the correct answer.
