MULTIPLE-CHOICE QUESTIONS

1. ______ is the formula of cuprite.
   
   
   
   1. Cu₂O
   2. Cu₂S
   3. CuCO₃
   4. CuCl₂
   
   


2. Siderite is an ore of ______.
   
   
   
   1. Copper
   2. Silver
   3. Calcium
   4. Iron
   
   


3. ______ is an ore of calcium.
   
   
   
   1. Magnetite
   2. Siderite
   3. Malachite
   4. Gypsum
   
   


4. During electrolytic reduction, ______ acts as reducing agent.
   
   
   
   1. anode
   2. cathode
   3. electrolyte
   4. the metal
   
   


5. Liquefaction method is used for the purification of metals with ______.
   
   
   
   1. high melting point
   2. low melting point
   3. high boiling point
   4. low boiling point
   
   


6. The formula of cryolite is ______.
   
   
   
   1. Cr₂O₃
   2. Na₃AlF₆
   3. Na₂AlF₆
   4. _Na2Cr2O7
   
   


7. _{Which of the following is a liquid metal at room temperature ?}
   
   
   
   1. _Sodium
   2. _Cobalt
   3. _Bromine
   4. _Mercury
   
   


8. _{______ m long thin wire can be drawn from 100 mg of silver.}
   
   
   
   1. ₅₀
   2. ₁₀₀
   3. ₂₀₀
   4. ₃₀₀
   
   


9. _{______ is the best conductor of heat and electricity.}
   
   
   
   1. _Gold
   2. _Silver
   3. _Copper
   4. _Iron
   
   


10. _{______ is a poor conducting metal for heat.}
    
    
    
    1. _Copper
    2. _Silver
    3. _Aluminium
    4. _Lead
    
    


11. _{The density of mercury is ______ g/cm³}
    
    
    
    1. _11.6
    2. _12.6
    3. _13.6
    4. _14.6
    
    


12. _{The melting point of tungsten is ______ °C.}
    
    
    
    1. ₃₄₁₀
    2. ₃₃₁₀
    3. ₃₂₁₀
    4. ₃₁₁₀
    
    


13. _{The true order of reactivity of metals with dil. HCl is ______.}
    
    
    
    1. _Mg>Al>Zn>Fe
    2. _Mg>Zn>Fe>Al
    3. _Al>Mg>Zn>Fe
    4. _Zn>Mg>Al>Fe
    
    


14. _{Pure gold is ______ carats.}
    
    
    
    1. ₂₂
    2. ₂₃
    3. ₂₄
    4. ₂₅
    
    


15. _{Bronze is an alloy of ______ and ______.}
    
    
    
    1. _{copper, aluminium}
    2. _{copper, zinc}
    3. _{copper, tin}
    4. _{iron, nickel}
    
    


16. _{Which of the following is used as a semi-conductor ?}
    
    
    
    1. _Copper
    2. _Silver
    3. _Gold
    4. _Germanium
    
    


17. _{The main constituent of bauxite is ______.}
    
    
    
    1. _Al2O3
    2. _Al2(SO4)3
    3. _CaSO4
    4. _Na3AlF6
    
    


18. _{Which method is used for the purification of more reactive metals ?}
    
    
    
    1. _{Chemical reduction}
    2. _Roasting
    3. _Calcination
    4. _{Electrochemical reduction}
    
    


19. _{Which reaction takes place at anode in an electrolytic process ?}
    
    
    
    1. _Oxidation
    2. _Reduction
    3. _{Oxidation-reduction}
    4. _{None of above}
    
    


20. _{Which metal is obtained in liquid state (during extraction) ?}
    
    
    
    1. _Sodium
    2. _Gallium
    3. _Tin
    4. _Uranium
    
    


21. _{Which substance is used to decrease the melting point of alumina in Hall - Haroult process ?}
    
    
    
    1. _CuSO4
    2. _Cryolite
    3. _Gypsum
    4. _Limonite