PRECIOUS SECONDARY SCHOOL, ARAMOKO-EKITI

1. 
   Which of the following is a physical change (a) freezing ice-cream (b) burning kerosene (c) dissolving calcium in water
   
2. 
   There are basic particles from which matter could be made except (a) atom (b) salt (c) ion
   
3. 
   The relative molecular mass of CaCO₃ is given (Ca=40, C=12, O=16) (a) 78 (b) 200 (c) 100
   
4. 
   Temporary hardness of water is removed my _______ (a) boiling (b)use of alum (c) use of chlorine
   
5. 
   An acid is a substance which in the presence of water produces (a) salt (b) hydroxonium ion (c) hydrogen gas.
   
6. 
   Which of the following is a general method of preparing acids (a) reaction between acid and base (b) direct combination of constituent (c) reaction between hydroxide and water
   
7. 
   Which of the following is a normal salt (a) NaCl (b) KHSO₄ (c) (NH4)₂ SO₄
   
8. 
   Which of the following will change the colour of blue to litmus (a) base (b) acid (c) salt
   
9. 
   Allotropes of an element differ in their (a) physical properties (b) electronic configuration (c) mass number.
   
10. 
    The use of diamond is abrasive is due to its (a) hardness (b) high melting point (c) durability.
    
11. 
    Hydrocarbon is a compound of hydrogen and ____(a) water (b) carbon (c) oxygen.
    
12. 
    Petroleum product that is use in making candles is (a) asphalt (b) bitumen (c) paraffin wax
    
13. 
    Fractional distillation of crude oil involves the following process (a) boiling, evaporation and condensation. (b) boiling (c) filtration.
    
14. 
    Which of the following is not a fraction of petroleum (a) kerosene (b) paraffin wax (c) sulphur
    
15. 
    Which of the following is not one of the man classes of hydrocarbon (a) negative hydrocarbon (b) saturated hydrocarbon (c) unsaturated hydrocarbon.
    
16. 
    The following are types of hardness of water except (a) temporary hardness (b) primary hardness (c) permanent hardness.
    
17. 
    The following are properties of water except (a) it is neutral to litrus (b) it is colourless and odourless (c) it is white in colour.
    
18. 
    Temporary hardness of water can be removed by (a) boiling (b) adding kerosene (c) filtration process.
    
19. 
    ______ is I U P A C name of H₂SO₄ (a) hydrogen sulphide (b) tetraoxosulphate(iv) acid (c) hydrogen trioxosulphate (ii)
    
20. 
    Calculate the oxidation number of carbon in CaCO₃ (a) vi (b) v (c) iv.
    

(1a) define the following

1. 
   Acid
   
2. 
   Base
   
3. 
   Neutralization
   

(2a) list five properties of water

(2b) explain fractional distillation of crude oil.

(3a) what is hydrocarbon