Study the given Venn diagram and identify points 1, 2 and 3.

Observe the given change carefully and identify W, X, Y and Z.

Match the given chemical reactions with the products listed and select the correct option from the given codes. 
(i)-$\mathrm{CaO}$
(ii)-$\mathrm{Mg}(\mathrm{OH}{)}_2$ 
(iii)-${\mathrm{NO}}_2$ 
(iv)-$\mathrm{Cu}$ 
(v)-${\mathrm{MgCl}}_2$ 
(vi)-${\mathrm{O}}_2$ 
(vii)-${\mathrm{Fe}}_2{\mathrm{O}}_3$
(viii)-${\mathrm{CaCO}}_3$

    P. Mixing magnesium oxide with water 
    Q. Brown deposit on iron nail kept in copper sulphate solution 
    R. Carbon dioxide is passed through lime water
    S. Absorption of ultraviolet radiations by ozone.
 

Observe the given figure carefully and fill in the blanks by choosing an appropriate option.

Which portion of the ship will rust the fastest?