General Princip...

Which of the following metals exist in their native state in nature?
(i) $$Cu$$
(ii)$$Au$$
(iii)$$Zn$$
(iv)$$Ag$$

Highly electropositive metal (s) can not be commercially extracted by carbon reduction process at high temperature because these : 

A mineral is usually associated with a large amount of unwanted material called :

Which one of the following elements is most abundant is earth crust ? 

Froth floatation process is used for the concentration of the ore of :

Which one of the following types of metals is expected to occur in the native state ?

Froth floatation process for the concentration of sulphide ores is an illustration of the practical application of :

Cinnabar is the ore of :

Copper is extracted from sulphide ore using the method :

In the alumino-thermite process, Al metal acts as :