Match List - I with List - II :

	List - I		List - II
(a)	Haematite	(i)	$$A{l_2}{O_3}\,.\,x{H_2}O$$
(b)	Bauxite	(ii)	$$F{e_2}{O_3}$$
(c)	Magnetite	(iii)	$$CuC{O_3}\,.\,Cu{(OH)_2}$$
(d)	Malachite	(iv)	$$F{e_3}{O_4}$$

Choose the correct answer from the options given below :

The set that represents the pair of neutral oxides of nitrogen is :

During which of the following processes, does entropy decrease?

(A) Freezing of water to ice at 0$$^\circ$$C

(B) Freezing of water to ice at $$-$$10$$^\circ$$C

(C) N₂(g) + 3H₂(g) $$ \to $$ 2NH₃(g)

(D) Adsorption of CO(g) on lead surface.

(E) Dissolution of NaCl in water

Choose the correct answer from the options given below :

For the coagulation of a negative sol, the species below, that has the highest flocculating power is :