NCERT Class – 9 Science Solution: Chapter 2 is Matter Around Us Pure-Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question: 6

Which of the following are physical changes?

  1. Melting of iron metal
  2. Rusting of iron
  3. Bending of an iron rod
  4. Drawing a wire of iron metal
  5. (i) , (ii) and (iii)
  6. (i) , (ii) and (iv)
  7. (i) , (iii) and (iv)
  8. (ii) , (iii) and (iv)

Answer: C

Physical Changes

Question: 7

Which of the following are chemical changes?

  1. Decaying of wood
  2. Burning of wood
  3. Sawing of wood
  4. Hammering of a nail into a piece of wood
  5. (i) and (ii)
  6. (ii) and (iii)
  7. (iii) and (iv)
  8. (i) and (iv)

Answer: A

Chemical Changes

Question: 8

Two substances, A and B were made to react to form a third substance,

according to the following reaction

Which of the following statements concerning this reaction are incorrect?

  1. The product shows the properties of substances A and B
  2. The product will always have a fixed composition
  3. The product so formed cannot be classified as a compound
  4. The product so formed is an element
  5. (i) , (ii) and (iii) ,
  6. (ii) , (iii) and (iv)
  7. (i) , (iii) and (iv)
  8. (ii) , (iii) and (iv)

Answer: C