Metals and Non-Metals

Corrosion of metals involves

• physical reactions        

• Chemical reactions

• both (a) And (b)

• none of these

The following factors play vital role in corrosion process .

• Temperature              

• Solute concentration           

• Both (a) and (b)   

• None of these

   Which of the following can be used for cathodic protection ?

• Al

• Cd     

• Cu          

• Either

Of these, the most ductile metal is

• Al   

• Au                 

• Cu            

• Ag

    Of these , the least dense metal is

• Hg         

• Au              

• Cu                  

• Na

An excess of iron filings is added to a solution containing a mixture of the iron Mg²⁺ , Ca²⁺ , Cu²⁺ and Ag+ . Which two metals will be displaced from this solution ?

• Calcium and copper        

• Calcium and magnesium       

• Copper and silver   

• Magnesium and silver 

Of these, the metals which occurs   in a free state and combined state are

• Na, Mg                   

• Mg, Au               

• Zn, K

• Cu, Ag

  Which of the following metal is extracted only by electrolysis ?

• Zn

• Al

• Fe                     

• Cu

Which oxide of a metal gets reduced only by coke and not by H₂ gas or CO gas ?

• Fe₂O₃  

• PbO     

• ZnO  

• CuO

  The Property of metal by which it can be drawn into wires is  called

• conductivity           

• malleability     

• ductility    

• decorating