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AIC SS2 Chemistry 3rd C.A Second Term
  • 1. 1. What is the mass of 0.25mole of calcium?
A) 40g
B) 20g
C) 15g
D) 10g
  • 2. 2. How many moles of oxygen are present in 16g of oxygen gas?
A) 5.12mole
B) 32.0mole
C) 1.0mole
D) 0.5mole
  • 3. 3. How many moles are contained in 50g of magnesium trioxocarbonate (IV)? [Mg =24, C= 12, O =16]
A) 8.4 moles
B) 0.6 mole
C) 84 moles
D) 42.00 moles
  • 4. 4. When 100cm³ of a saturated solution of KClO3 at 40°c is evaporated,14g of the salt is recovered. What is the solubility of KClO3 at 40°c . [KClO3 = 122.5]
A) 11.42 mol/dm³
B) 8.80 mol/dm³
C) 1.14 mol/dm³
D) 0.88 mol/dm³
  • 5. 5. What is the solubility of X im mol/dm³ if 25cm³ of its saturated solution contains 4.0g of X? [X = 60g/mol]
A) 6.0
B) 1.7
C) 2.7
D) 0.27
  • 6. 6. One of the characteristics of the solute in a colloidal solution is that it can ..........
A) Not sedimentate
B) Not scatter light rays
C) Coagulate
D) Dialyse
  • 7. 7. Pollution of rivers by organic waste is harmful to aquatic organisms because of ........
A) Increase in the level of sediment
B) Scarcity of food in water
C) Reduction in the amount of dissolved oxygen
D) Presence of heavy metal ions
  • 8. 8. The furring of kettles is caused by the presence of ...........in water.
A) Calcium tetraoxosulphate (VI)
B) Calcium hydrogen trioxocarbonate (IV)
C) Calcium hydroxide
D) Calcium trioxocarbonate (IV)
  • 9. 9. Steam changes the colour of anhydrous cobalt (ii) chloride from ......
A) Blue to white
B) Blue to pink
C) White to red
D) White to green
  • 10. 10. The chemical used for coagulation in water purification is .....
A) Sodium tetraoxosulphate (VI)
B) Copper tetraoxosulphate (VI)
C) Aluminium tetraoxosulphate (VI)
D) Calcium tetraoxosulphate (VI)
  • 11. 11. Which of the following is used as water softener ?
A) MgSO4.7H2O
B) Na2CO3.10H2O
C) Na2SO4.10H2O
D) CaCl2.2H20
  • 12. 12. Which of the following processes will pollute water?
A) Exposure of a body of water to ultraviolet rays
B) Addition of a measured quantity of chlorine to water
C) Discharge of industrial effluents into water ways.
D) Passage of river water through a sand bed
  • 13. 13. Which of the following material is called non-biodegradable pollutant?
A) Animal hide
B) Paper
C) Wood
D) Plastics
  • 14. 14. The pollution from petroleum spillage in the rivers and lakes can best be dispersed by......
A) Pouring of organic solvent
B) Evaporation
C) Passing of ships through the area
D) Pouring of detergents
  • 15. 15. A solution which dissolves more solutes than it can normally hold at a particular temperature is said to be .......
A) Saturated
B) Hydrated
C) Super saturated
D) Unsaturated
  • 16. 16. The method than can be used to convert hard water to soft water is .........
A) Chlorination
B) Aeration
C) The use of an ion -exchange resin
D) Passing over treated charcoal
  • 17. 17. Water hardness could be caused by the presence of ........
A) Calcium hydrogen trioxocarbonate (IV)
B) Sodium hydroxide
C) Calcium trioxocarbonate (IV)
D) Sodium aluminium trioxo -silicate (IV)
  • 18. 18. Which of the following is not a treated water?
A) Chlorinated water
B) Spring water
C) Distilled water
D) Pipe borne water
  • 19. 19. --------- are heterogeneous mixture of undissolved particles in a given medium.
A) Solute
B) Solution
C) Solvent
D) Suspensions
  • 20. 20. The most common solvent in nature is referred to as.......
A) Dispersion medium
B) Colloids
C) Universal solvent
D) Concentration
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