NCERT Class – 9 Science solution: Chapter 2 Is Matter Around Us Pure-Part 1

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Multiple Choice Questions

Question: 1

Which of the following statements are true for pure substances?

  1. Pure substances contain only one kind of particles

  2. Pure substances may be compounds or mixtures

  3. Pure substances have the same composition throughout

  4. Pure substances can be exemplified by all elements other than nickel

  5. (i) and (ii)

  6. (i) and (iii)

  7. (iii) and (iv)

  8. (ii) and (iii)

Answer: B

Question: 2

Rusting of an article made up of iron is called

  1. corrosion and it is a physical as well as chemical change

  2. dissolution and it is a physical change

  3. corrosion and it is a chemical change

  4. dissolution and it is a chemical change

Answer: C

Image of Rusting of Iron

Image of Rusting of Iron

Image of Rusting of Iron

Question: 3

A mixture of sulphur and carbon disulphide is

  1. heterogeneous and shows Tyndall effect

  2. homogeneous and shows Tyndall effect

  3. heterogeneous and does not show Tyndall effect

  4. homogeneous and does not show Tyndall effect

Answer: D

Question: 4

Tincture of iodine has antiseptic properties. This solution is made by dissolving

  1. iodine in potassium iodide

  2. iodine in vaseline

  3. iodine in water

  4. iodine in alcohol

Answer: D

Image of Tincture of iodine

Image of Tincture of Iodine

Image of Tincture of iodine

Question: 5

Which of the following are homogeneous in nature?

  1. ice

  2. wood

  3. soil

  4. air

  5. (i) and (iii)

  6. (ii) and (iv)

  7. (i) and (iv)

  8. (iii) and (iv)

Answer: C

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