Match List-I with List-II :

	List - I (Name of ore/mineral)		List - II (Chemical formula)
(a)	Calmine	(i)	$$Zns$$
(b)	Malachite	(ii)	$$FeC{O_3}$$
(c)	Siderite	(iii)	$$ZnC{O_3}$$
(d)	Sphalerite	(iv)	$$CuC{O_3}.Cu{(OH)_2}$$

Choose the most appropriate answer from the options given below :

Which refining process is generally used in the purification of low melting metals?

Given below are two statements :

Statement I : Sphalerite is a sulphide or of zinc and copper glance is a sulphide ore of copper.

Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a forth flotation method.

Choose the most appropriate answer from the options given below :

Given below are two statements :

Statement I : The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of $$\Delta$$G vs temperature.

Statement II : The value of $$\Delta$$S increases from left to right in Ellingham diagram.

In the light of the above statements, choose the most appropriate answer from the options given below :