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Doctors Medicines MCQs Q&A

  1. 1 and 2
  2. 1, 2 and 3
  3. 3 and 4
  4. All of the above
  5. None of the above/More than one of the above
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1 Answers

Option 1 : 1 and 2

The correct answer is 1 and 2.

  • A change in which one or more new substances are formed is known as chemical change.
  • A change in which one or more new substances are formed is called a chemical change.
  • A chemical change is also called a chemical reaction.
  • A chemical change is generally irreversible.
  • Growth of a plant, Rusting of iron, Cooking of food, Burning of a candle, and Digestion of food are all chemical changes as these are irreversible.
    • Hence 1 and 2 is the correct option.

  • Physical change:
    • Properties such as shape, size, colour and state of a substance are called its physical properties.
    • A change in which a substance undergoes a change in its physical properties is called a physical change.
    • A physical change is generally reversible. In such a change no new substance is formed.
    • Freezing of water, Mixing of iron filings and sand is a physical change as no new substance is formed and the change is reversible.
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