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Q: Which of the following is a physical change?
  • A. Water changes to ice
  • B. Respiration in humans
  • C. Digestion in humans
  • D. Making yogurt from milk
Correct Answer: Option A - Such a change in a substance, in which the chemical properties of the substance remain the same, but the physical properties of the substance change, is called physical change for example- change of water into ice. The change in any substance in which a new substance is formed, which is completely different from the chemical and physical properties of the original substance, is called a chemical change. For example, rusting of iron, formation of curd from milk etc.
A. Such a change in a substance, in which the chemical properties of the substance remain the same, but the physical properties of the substance change, is called physical change for example- change of water into ice. The change in any substance in which a new substance is formed, which is completely different from the chemical and physical properties of the original substance, is called a chemical change. For example, rusting of iron, formation of curd from milk etc.

Explanations:

Such a change in a substance, in which the chemical properties of the substance remain the same, but the physical properties of the substance change, is called physical change for example- change of water into ice. The change in any substance in which a new substance is formed, which is completely different from the chemical and physical properties of the original substance, is called a chemical change. For example, rusting of iron, formation of curd from milk etc.