Olympiad/HOTS Corner

Observe the given figures carefully.

Read the given passage and fill in the blanks by selecting an appropriate option. 
Figures 1 and 2 both represent a (i) change. In figure 1, P is (ii) and Q is (iii) . In figure 2, X and Y can be (iv) and (v) respectively.

Vishakha took a few wire pieces made up of different metals and placed them in a blue-coloured solution of copper sulphate. What will be the colour of the solutions present in beakers I, II and III after half an hour?

Observe the given figure carefully and select the correct statements.

    I. Heat is evolved in this reaction. 
    II. The colour of the mixture in the conical flask is pink in the beginning. 
    III. It represents a neutralisation reaction. 
    IV. No new substance is formed in the reaction.
 

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?