NCERT Class – 9 Science solution: Chapter 2 Is Matter Around Us Pure-Part 2

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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

Image of physical changes

Image of Physical Changes

Image of 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

image of chemical changes

Image of Chemical Changes

image of 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