CBSE Class 9 Science Exploring Mixtures and Their Separation (Class 9 NCERT New) Quiz 12

1. Which of the following are chemical changes? i. Decaying of wood. ii. Burning of wood. iii. Sawing of wood. iv. Hammering of nail into wood.

A (i) and (ii) B (ii) and (iii) C (iii) and (iv) D (i) and (iv)

2. Which of the following are physical changes? i. Melting of iron metal. ii. Rusting of iron metal. iii. Bending of an iron rod. iv. Drawing wire of iron metal.

A (i), (ii) and (iii) B (i), (ii) and (iv) C (i), (iii) and (iv) D (ii), (iii) and (iv)

3. Which of the following statements are true for pure substances? i. Pure substances contain only one kind of particles. ii. Pure substances may be compounds or mixtures. iii. Pure substances have the same composition throughout. iv. Pure substances can be exemplified by all elements other than nickel.

A (i) and (ii) B (i) and (iii) C (iii) and (iv) D (ii) and (iii)

4. What is the technique used to separate components of ink?

A Filtration B Distillation C Sublimation D Chromatography

5. Which is the most effective method of separating mixtures of miscible volatile liquids?

A Fractional distillation B Hand picking C Chromatography D Filtration

6. Which of the following is a separation technique to separate potassium chloride and ammonium chloride?

A Distillation B Evaporation C Condensation D Sublimation

7. Which of the following is not an emulsion?

A Milk B Butter C Face cream D Shaving cream

8. Which of the following is separation technique to separate kerosene oil, water and salt?

A Funnel separation B Evaporation C Distillation D All of these

9. Which of the following mixture cannot be separated by using water as the solvent?

A Copper sulphate and sand B Sand and potash alum C Sand and sulphur D Sugar and sand

10. Which of the following represents the solubility of sugar in water at 20°C?

A 21 g B 204 g C 37 g D 164 g