Answer the given question:
 
1.  Komal is provided with three iron nails, each dipped in oil, water and vinegar. Which iron nail will not rust, and why?
 
i.  Define rusting:
 
ii. What is the nature of vinegar? Why does the iron nail placed in vinegar rust faster than iron nail placed in water?
Reason:
 
iii. Write the word equation for rusting.