9th Class Chemistry Chapter 17 Test17. Separation Techniques

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Which substance would have a higher rate of evaporation?
   1. water at 10 ºC
   2. water at 20 ºC
   3. water at 5 ºC
   4. water at 30 ºC
2. What happens to a liquid in an enclosed space during evaporation until saturation in reached:
   1. it solidifies
   2. it remains constant
   3. it evaporates completely
   4. it continues to vaporize
3. Which process involves the formation of stalagmites and stalactities in cave?
   1. filtration
   2. crystallization
   3. distillation
   4. evaporation
4. What determine the formation of crystals during crystallization?
   1. temperature and pressure
   2. size of the container
   3. type os solvent used
   4. color of the solute
5. Which distilled product finds application in lead-acid batteries?
   1. crude oil
   2. distilled water
   3. essentail oil
   4. alcohol
6. What is another term for filtration by filter paper?
   1. vacuum filtration
   2. simple filtration
   3. gravity filtration
   4. buchner filtration
7. What happens to the rate of evaporation when temperature inncrease?
   1. it decrease
   2. it remains constant
   3. it increases
   4. it depends on pressure
8. What observation confirms that crystallization is occuring in a saturated solution?
   1. the solution turns blue
   2. cloudiness and crystal formation
   3. bubbles from at the surface
   4. the solution become denser
9. Which type of mixture involves evenly distributed solute particles in a solvent?
   1. hetrogeneous mixture
   2. homogeneous mixture
   3. solution
   4. suspension
10. What characteristics indicates that a substance is pure according to the text?
    1. Fixed melting and boiling point
    2. High solubility in water
    3. Variable boiling points
    4. strong intermolecular forces